Bernie Sanders calls a Donald Trump presidency a 'real danger to the entire world'

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Donald Trump withdrawals debate offer with Bernie Sanders

Bernie Sanders pulled no punches when he dropped by Real Time with Bill Maher on Friday night.

The Vermont senator and presidential hopeful said on the HBO show that he still wanted to debate the presumptive GOP presidential nominee and warned about Trump being elected president.

"You know, Trump claims to be a real tough guy, pushes people around. Hey, Donald Let's have a debate about the future of America," Sanders said.

On Friday, Trump said he decided he would not debate Sanders since Hillary Clinton is in the lead for the Democratic presidential nomination.

See Bernie Sanders at recent campaign events:

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Bernie Sanders calls a Donald Trump presidency a 'real danger to the entire world'
NEW YORK, NEW YORK - APRIL 13: Attendees await the start of a campaign event for Democratic presidential candidate U.S. Senator Bernie Sanders (not pictured) at Washington Square Park on April 13, 2016 in New York City. (Photo by D Dipasupil/WireImage)
NEW YORK, NEW YORK - APRIL 13: Attendees await the start of a campaign event for Democratic presidential candidate U.S. Senator Bernie Sanders (not pictured) at Washington Square Park on April 13, 2016 in New York City. (Photo by D Dipasupil/WireImage)
Attendees hold signs in support of Senator Bernie Sanders, an independent from Vermont and 2016 Democratic presidential candidate, not pictured, at a campaign event in New York, U.S., on Wednesday, April 13, 2016. Sanders stepped up his feud with General Electric Co., denouncing the manufacturer as 'greedy' and accusing Chief Executive Officer Jeffrey Immelt of not being truthful in responding to the attacks. Photographer: Victor J. Blue/Bloomberg via Getty Images
Natalia Plaza (L) and Suzanne Tufan, with their faces painted, wait for a campaign rally with U.S. Democratic presidential candidate and U.S. Senator Bernie Sanders in Washington Square Park in the Greenwich Village neighborhood of New York, New York April 13, 2016. REUTERS/Brian Snyder
An attendee wears a t-shirt in support of Senator Bernie Sanders, an independent from Vermont and 2016 Democratic presidential candidate, not pictured, at a campaign event in New York, U.S., on Wednesday, April 13, 2016. Sanders stepped up his feud with General Electric Co., denouncing the manufacturer as 'greedy' and accusing Chief Executive Officer Jeffrey Immelt of not being truthful in responding to the attacks. Photographer: Victor J. Blue/Bloomberg via Getty Images
An attendee holds a sign in support of Senator Bernie Sanders, an independent from Vermont and 2016 Democratic presidential candidate, not pictured, at a campaign event in New York, U.S., on Wednesday, April 13, 2016. Sanders stepped up his feud with General Electric Co., denouncing the manufacturer as 'greedy' and accusing Chief Executive Officer Jeffrey Immelt of not being truthful in responding to the attacks. Photographer: Victor J. Blue/Bloomberg via Getty Images
NEW YORK, NEW YORK - APRIL 13: Rosario Dawson speaks onstage at a campaign event for Democratic presidential candidate U.S. Senator Bernie Sanders (not pictured) at Washington Square Park on April 13, 2016 in New York City. (Photo by D Dipasupil/WireImage)
NEW YORK, NY - APRIL 13: Film director Spike Lee attends the Bernie Sanders rally in Washington Square Park on April 13, 2016 in New York City. (Photo by Mireya Acierto/FilmMagic)
MANHATTAN, NY - APRIL 13: U.S. Presidential candidate Bernie Sanders (I-VT) campaigns at Washington Square Park in Manhattan, NY, on April 13, 2016. (Photo by Yana Paskova/For The Washington Post via Getty Images)
U.S. Democratic presidential candidate Bernie Sanders addresses supporters at his campaign rally in Washington Square Park in the Greenwich Village neighborhood of New York City, April 13, 2016. REUTERS/Brendan McDermid
U.S. Democratic presidential candidate Bernie Sanders addresses supporters at his campaign rally in Washington Square Park in the Greenwich Village neighborhood of New York City, April 13, 2016. REUTERS/Brian Snyder
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Sanders then said he thinks Trump is "crazy" and him winning the White House would be dangerous.

"This guy is a pathological lair and I don't me to be malicious, but that is just the damn truth," Sanders said. "And he would not only be an embarrassment, but a real danger to the entire world if he were to become president."

Sanders admitted combating Trump in the general election would be difficult.

I would not be honest if I said I figured it out yet because he is so unpredictable because he changes his mind all the time," Sanders said.

Maher ended the interview by telling Sanders to not give up with his bid. "You're killing it," the host said.

See passionate supporters of Bernie Sanders:

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Bernie Sanders supporters
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Bernie Sanders calls a Donald Trump presidency a 'real danger to the entire world'
Supporters stand in the crowd cheering as they wait for U.S. Democratic presidential candidate Bernie Sanders to speak during a rally in Carson, California, U.S., May 17, 2016. REUTERS/Lucy Nicholson
A man covered in face paint waits to see U.S. Democratic presidential candidate Bernie Sanders during a campaign event in Vallejo, California, May 18, 2016. REUTERS/Stephen Lam TPX IMAGES OF THE DAY
Supporters stand in the crowd cheering as they wait for U.S. Democratic presidential candidate Bernie Sanders to speak during a rally in Carson, California, U.S., May 17, 2016. REUTERS/Lucy Nicholson
A supporter holds a sign as the crowd waits for U.S. Democratic presidential candidate Bernie Sanders to speak during a rally in Carson, California, U.S., May 17, 2016. REUTERS/Lucy Nicholson FOR EDITORIAL USE ONLY. NO RESALES. NO ARCHIVES.
Women hold up signs and cheer as they wait for U.S. Democratic presidential candidate Bernie Sanders to speak during a rally in Carson, California, U.S., May 17, 2016. REUTERS/Lucy Nicholson
UCLA graduate Miguel Rodriguez, 32, (R) and Joannie Small, 4, queue to listen to U.S. Democratic presidential candidate Bernie Sanders speak at a campaign rally at Casa del Mexicano in Los Angeles, California, U.S. June 4, 2016. REUTERS/Lucy Nicholson
A Bernie Sanders supporter texts before the U S. Democratic presidential candidate's campaign rally at Colton Hall in Monterey, California, U.S., May 31, 2016. REUTERS/Michael Fiala
Bernie Sanders supporter Drew Rainer dances prior to the U S. Democratic presidential candidate's campaign rally at Colton Hall in Monterey, California, U.S., May 31, 2016. REUTERS/Michael Fiala
An attendee reacts as Democratic U.S. presidential candidate Bernie Sanders prepares to enter Kaiser Permanente Arena during a campaign rally in Santa Cruz, California May 31, 2016. REUTERS/Stephen Lam
An attendee holds a sign in support of Democratic U.S. presidential candidate Bernie Sanders during a campaign rally in Santa Cruz, California, U.S., May 31, 2016. REUTERS/Stephen Lam
A woman holds a sign in support of Democratic U.S. presidential candidate Bernie Sanders during a campaign rally in Santa Cruz, California, U.S., May 31, 2016. REUTERS/Stephen Lam
Supporters cheer for U.S. Democratic presidential candidate Bernie Sanders as he speaks at a campaign rally in Santa Barbara, California, U.S. May 28, 2016. REUTERS/Lucy Nicholson
Supporters listen as U.S. Democratic presidential candidate Bernie Sanders speaks at a campaign rally in Santa Maria, California, U.S. May 28, 2016. REUTERS/Lucy Nicholson
Supporters cheer for U.S. Democratic presidential candidate Bernie Sanders as he speaks at a campaign rally in Santa Barbara, California, U.S. May 28, 2016. REUTERS/Lucy Nicholson
Supporters wait for U.S. Democratic presidential candidate Bernie Sanders to speak at a campaign rally in Santa Barbara, California, U.S. May 28, 2016. REUTERS/Lucy Nicholson
U.S. Democratic presidential candidate Bernie Sanders greets supporters after a campaign rally in Santa Maria, California, U.S. May 28, 2016. REUTERS/Lucy Nicholson
U.S. Democratic presidential candidate Bernie Sanders looks as supporters wish him and his wife a happy wedding anniversary at a campaign rally in Santa Barbara, California, U.S. May 28, 2016. REUTERS/Lucy Nicholson TPX IMAGES OF THE DAY
Tyler Morris holds up look-a-like puppet of Democratic U.S. presidential candidate Bernie Sanders is held up during campaign event in San Pedro, California, U.S. May 27, 2016. REUTERS/Kevork Djansezian
A supporter holds a poster of Democratic U.S. presidential candidate Bernie Sanders at a campaign event in San Pedro, California , U.S. May 27, 2016. REUTERS/Kevork Djansezian FOR EDITORIAL USE ONLY. NO RESALES. NO ARCHIVES.
Supporter Tina Boyd holds signs inside Johnie's Coffee Shop, which has been closed since 2000, during a one night only re-opening for a rally in favor of Democratic U.S. presidential candidate Bernie Sanders in Los Angeles, U.S., May 26, 2016. REUTERS/Mario Anzuoni
Supporters of U.S. Democratic presidential candidate Bernie Sanders cheer at a campaign event in Ventura, California, U.S. May 26, 2016. REUTERS/Jonathan Alcorn
Charles Parker of Desert Hot Springs shows off his large replica U S. Democratic presidential candidate Bernie Sanders head while waiting in line to hear the senator speak at a campaign rally in Cathedral City, California, U.S., May 25, 2016. REUTERS/Alex Gallardo
Bradley Giles of Cathedral City waits to enter to hear U.S. Democratic presidential candidate Bernie Sanders speak at a campaign rally in Cathedral City, California, U.S., May 25, 2016. REUTERS/Alex Gallardo
Supporters cheer as U.S. Democratic presidential candidate Bernie Sanders arrives to speak at a rally in Anaheim, California, United States, May 24, 2016. REUTERS/Mike Blake
Supporters wait in line to attend a morning rally for U.S. Democratic presidential candidate Bernie Sanders in Anaheim, California, U.S., May 24, 2016. REUTERS/Mike Blake
Supporters listen to U.S. Democratic presidential candidate Bernie Sanders speak in Santa Monica, California, U.S., May 23, 2016. REUTERS/Lucy Nicholson
Supporters hold signs after U.S. Democratic presidential candidate Bernie Sanders' motorcade passed by in Santa Monica, California, U.S., May 23, 2016. REUTERS/Lucy Nicholson
Supporter Maria Antonio waits for U.S. Democratic presidential candidate Bernie Sanders to speak in East Los Angeles, California, U.S. May 23, 2016. REUTERS/Lucy Nicholson
Supporter Mette Peluce, 11, waits for U.S. Democratic presidential candidate Bernie Sanders to speak in East Los Angeles, California, U.S. May 23, 2016. REUTERS/Lucy Nicholson. TPX IMAGES OF THE DAY
Supporter Koelen Andrews, 34, waits for U.S. Democratic presidential candidate Bernie Sanders to speak in East Los Angeles, California, U.S. May 23, 2016. REUTERS/Lucy Nicholson
Supporters wait for U.S. Democratic presidential candidate Bernie Sanders to speak in East Los Angeles, California, U.S. May 23, 2016. REUTERS/Lucy Nicholson
A supporter waits for U.S. Democratic presidential candidate Bernie Sanders to speak in East Los Angeles, California, U.S. May 23, 2016. REUTERS/Lucy Nicholson FOR EDITORIAL USE ONLY. NO RESALES. NO ARCHIVES.
People cheer at a campaign rally for U S. Democratic presidential candidate Bernie Sanders in Irvine, California, U.S. May 22, 2016. REUTERS/Alex Gallardo
Young female supports cheer as U.S. Democratic presidential candidate Bernie Sanders steps up to the podium during a rally in Vista, California, United States May 22, 2016. REUTERS/Mike Blake
Supporters cheer as U.S. Democratic presidential candidate Bernie Sanders speaks during a rally in Vista, California, United States, May 22, 2016. REUTERS/Mike Blake
Joshua Zepeda of Escondido, takes off his shirt as he attends a rally for U.S. Democratic presidential candidate Bernie Sanders in Vista, California, United States, May 22, 2016. REUTERS/Mike Blake
A supporter of U.S. Democratic presidential candidate Bernie Sanders wears a wig in San Juan, Puerto Rico, May 16, 2016. REUTERS/Alvin Baez
Supporters cheer for U.S. Democratic presidential candidate Bernie Sanders at a campaign rally in Stockton, California, United States, May 10, 2016. REUTERS/Max Whittaker
From left, Myrna Leon, her daughter Bella Leon and her mother Frances Hernandez cheer for U.S. Democratic presidential candidate Bernie Sanders at a campaign rally in Stockton, California, United States, May 10, 2016. REUTERS/Max Whittaker
Supporters cheer for U.S. Democratic presidential candidate Bernie Sanders at a campaign rally in Stockton, California, United States, May 10, 2016. REUTERS/Max Whittaker
Supporters cheer and hold up banners before the arrival of U.S. Democratic presidential candidate Bernie Sanders at a campaign rally in Sacramento, California United States May 9, 2016. REUTERS/Fred Greaves
Brydon Sullivan, 8, wearing a Bernie Sanders costume, waits for the U.S. Democratic presidential candidate Sanders to arrive at a campaign rally in Sacramento, California United States May 9, 2016. REUTERS/Fred Greaves
Supporters cheer as U.S. Democratic presidential candidate Bernie Sanders speaks at a campaign rally in New Brunswick, New Jersey, U.S., May 8, 2016. REUTERS/Dominick Reuter
Democratic presidential candidate Bernie Sanders addresses the crowd during a campaign rally at Heritage Hall in Lexington, Kentucky, U.S. May 4, 2016. REUTERS/John Sommers II
Supporters of Democratic U.S. presidential candidate and U.S. Senator Bernie Sanders cheer during his five state primary night rally in Huntington, West Virginia, U.S., April 26, 2016. REUTERS/Marcus Constantino
ATLANTIC CITY, NJ - MAY 9: Bernie Sanders supporters cheer during a rally with the Democratic presidential hopeful at Boardwalk Hall on May 9, 2016 in Atlantic City, New Jersey. Sanders is campaigning in New Jersey ahead of the state's primary on June 7. (Photo by Mark Makela/Getty Images)
PORTLAND, ME - MAY 5: Bernie Sanders supporters holding a 'We Love Bernie March' a day before the state Democratic Party Convention march down Congress St. in Portland Thursday, May 5, 2016. (Photo by Shawn Patrick Ouellette/Portland Press Herald via Getty Images)
LOUISVILLE, KY - MAY 3: Campaign supporters show their support for Democratic presidential candidate Bernie Sanders as he speaks to them during a campaign rally at the Big Four Lawn park May 3, 2016 in Louisville, Kentucky. Sanders is preparing for Kentucky's May 17th primary. (Photo by John Sommers II/Getty Images)
LOUISVILLE, KY - MAY 3: Campaign supporters show their support for Democratic presidential candidate Bernie Sanders as he speaks to them during a campaign rally at the Big Four Lawn park May 3, 2016 in Louisville, Kentucky. Sanders is preparing for Kentucky's May 17th primary. (Photo by John Sommers II/Getty Images)
SOUTH BEND, IN - MAY 01: People cheer as Democratic presidential candidate Bernie Sanders (D-VT) speaks during a campaign rally at the Century Center on May 1, 2016 in South Bend, Indiana. Sanders continues to campaign leading up to the state of Indiana's primary day on Tuesday. (Photo by Joe Raedle/Getty Images)
INDIANAPOLIS, IN - APRIL 29: People listen as Democratic presidential candidate and U.S. Sen. Bernie Sanders (D-VT) speaks during a rally at the Indiana state Capitol on April 29, 2016 in Indianapolis, Indiana. Sanders addressed the rally of mostly union workers and their supporters protesting the Carrier Corp. plans to cut 1,400 manufacturing jobs in Indianapolis and move 2,100 jobs to Mexico. (Photo by Joe Raedle/Getty Images)
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