Trump campaign takes aim at Joe Biden's possible 2020 run: 'The Left just doesn’t get it'

The next presidential election may be years away, but the Trump team is already targeting one possible 2020 Democratic challenger.

SEE ALSO: Joe Biden is creating a political action committee

In a campaign email sent to supporters on Monday, Trump headquarters responded to swirling rumors that former Vice President Joe Biden is mulling a bid to challenge President Trump for the White House.

"American voters rejected Hillary Clinton's and Barack Obama's disastrous policies last November, but now Joe Biden is preparing to challenge President Trump in 2020," the campaign wrote in an email that also requested campaign donations.

Click through some of the top names who might run against Trump in 2020:

44 PHOTOS
People who might run against Trump in 2020
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People who might run against Trump in 2020

Former Vice President Joe Biden

(Photo by Patrick T. Fallon/Bloomberg via Getty Images)

Sen. Bernie Sanders (I-Vt.)

(Photo by Scott Eisen/Getty Images)

Sen. Elizabeth Warren (D-Mass.)

(Photo by Craig F. Walker/The Boston Globe via Getty Images)

Sen. Kamala Davis (D-Calif.)

(Photo By Bill Clark/CQ Roll Call)

Sen. Chris Murphy (D-Conn.)

(Photo by Zach Gibson/Getty Images)

Sen. Amy Klobuchar (D-Minn.)

(Photo by Drew Angerer/Getty Images)

Facebook CEO and founder Mark Zuckerberg

(Photo by David Paul Morris/Bloomberg via Getty Images)

Sen. Cory Booker (D-N.J.)

(Photo by Jason LaVeris/FilmMagic)

Sen. Kirsten Gillibrand (D-N.Y.)

(Photo by: Lloyd Bishop/NBC/NBCU Photo Bank via Getty Images)

Colorado Gov. John Hickenlooper

(Photo By Bill Clark/CQ Roll Call)

New York Gov. Andrew Cuomo

(Photo credit MENAHEM KAHANA/AFP/Getty Images)

Former Maryland Gov. Martin O'Malley

(Photo credit NICHOLAS KAMM/AFP/Getty Images)

Former Housing and Urban Development Secretary Julian Castro

(Photo by Pete Marovich/Bloomberg via Getty Images)

Sen. Tim Kaine (D-Va.)

(Photo by Daniel Acker/Bloomberg via Getty Images)

Sen. Al Franken (D-Minn.)

(Photo by Zach Gibson/Getty Images)

Sen. Al Franken (D-Minn.)

(Photo credit ZACH GIBSON/AFP/Getty Images)

Former Massachusetts Gov. Deval Patrick

(Photo by Suzanne Kreiter/The Boston Globe via Getty Images)

New York City Mayor Bill de Blasio

(Photo by James Keivom/NY Daily News via Getty Images)

Dallas Mavericks owner Mark Cuban

(Photo by Andrew Harrer/Bloomberg via Getty Images)

Environmental activist Tom Steyer

(Photo by David Paul Morris/Bloomberg via Getty Images)

Democratic National Committee Chairman Tom Perez

(Photo by Taylor Hill/FilmMagic)

Minnesota Gov. Mark Dayton 

(Photo by Stephen Maturen/Getty Images)

Virginia Gov. Terry McAuliffe

(Photo by Drew Angerer/Getty Images)

California Lt. Gov. Gavin Newsom

(Photo by Yichuan Cao/NurPhoto via Getty Images)

Facebook COO Sheryl Sandberg

(Photo credit FABRICE COFFRINI/AFP/Getty Images)

Starbucks CEO Howard Schultz

(Photo by Stephen Brashear/Getty Images)

Former first lady Michelle Obama

(Photo by Gerardo Mora/Getty Images)

Dwayne "The Rock" Johnson

(Photo by Donna Ward/Getty Images)

Rep. Tulsi Gabbard (D-Hawaii)

(Photo credit TIMOTHY A. CLARY/AFP/Getty Images)

Rep. Keith Ellison (D-Minn.)

(Photo by Alex Wong/Getty Images)

Rep. Sean Patrick Maloney (D-N.Y)

(Photo By Tom Williams/CQ Roll Call)

California Gov. Jerry Brown

(Photo by Tiffany Rose/Getty Images for Caruso )

Media mogul Oprah Winfrey

(Photo by Moeletsi Mabe/Sunday Times/Gallo Images/Getty Images)

Former Sen. Russ Feingold (D-Wis.)

(Photo By Tom Williams/CQ Roll Call)

Former Vermont Gov. Howard Dean

(Marcus Yam / Los Angeles Times)

Former Vice President Al Gore

(Photo credit DAVID MCNEW/AFP/Getty Images)

Sen. Mark Warner (D-Va.)

(Photo by Katherine Frey/The Washington Post via Getty Images)

Former Sen. Jim Webb (D-Va.)

(Photo by Andrew Harrer/Bloomberg via Getty Images)

Los Angeles Mayor Eric Garcetti

(Photo by Rodin Eckenroth/Getty Images,)

Rep. Seth Moulton (D-Mass.)

(Photo by Craig F. Walker/The Boston Globe via Getty Images)

New Orleans Mayor Mitch Landrieu

Albin Lohr-Jones/Pool via Bloomberg

Sen. Tammy Duckworth (D-Ill.)

(Photo by Scott Olson/Getty Images)

Washington Gov. Jay Inslee

(Photo by Karen Ducey/Getty Images)

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The Trump campaign called Biden an "extreme liberal" who will "spend every waking minute over the next four years trying to tear down OUR President."

"Joe Biden won't be the only Democrat to try to stop all of Donald Trump's progress, and with the fake news media committed now more than ever to spreading lies about the President, we need to be ready," the campaign continued in the email.

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Biden admitted after Clinton's 2016 election loss that he regretted not running for president after eight years as vice president.

"I had planned on running for president and although it would have been a very difficult primary, I think I could have won," Biden said. "I don't know, maybe not. But I thought I could have won."

"But do I regret not being president? Yes. I was the best qualified," Biden added.

Biden's name has recently picked up steam as a top prospect for Democrats in 2020. While speaking at the SALT Conference in Las Vegas, the former vice president said "he may very well run" for in the upcoming presidential election.

"I never thought [Hillary Clinton] was the correct candidate," he added. "I thought I was the correct candidate."

The former vice president added even more fuel to the fire after launching a political action committee this week — a telltale sign that he might be contemplating something further.

Attacking potential 2020 opponents isn't anything new for President Trump. While speaking at the National Rifle Association (NRA) Leadership Forum in April he mockingly said "It may be Pocahontas" in 2020, "And she is not big for the NRA," referring to Sen. Elizabeth Warren.

Warren told MSNBC host Rachel Maddow in April she's "not running for president in 2020."

28 PHOTOS
Hillary Clinton and Joe Biden together through the years
See Gallery
Hillary Clinton and Joe Biden together through the years
U.S. Vice President Joe Biden (L) and former Secretary of State Hillary Clinton (R) attend a ceremony to unveil a portrait honoring retiring Senate Minority Leader Harry Reid (D-NV) on Capitol Hill in Washington, U.S. December 8, 2016. REUTERS/Jonathan Ernst
US Secretary of State Hillary Clinton (L) is joined by her husband former US President Bill Clinton (R) and US Vice President Joe Biden as she is ceremonially sworn in at the State Department in Washington, February 2, 2009. REUTERS/Jonathan Ernst (UNITED STATES)
Democratic presidential nominee Hillary Clinton welcomes Vice President Joe Biden as he disembarks from Air Force Two for a joint campaign event in Scranton, Pennsylvania, August 15, 2016. REUTERS/Charles Mostoller
PORTSMOUTH, NH - MAY 11: Democratic presidential candidate Senator Hillary Clinton (D-NY) greets fellow presidential candidate Joe Biden (D-DE) in the lobby of the Sheraton Harborside Portsmouth after addressing the International Association of Fire Fighters Convention (IAFF) Conference May 11, 2007 in Portsmouth, New Hampshire. The IAFF is a labor union of fire fighters from the United States and Canada, formed in 1918, consisting of 280,000 members. (Photo by Darren McCollester/Getty Images)
Democratic presidential candidate Hillary Clinton and Vice-President Joe Biden campaign together during an event in Scranton, Pennsylvania, August 15, 2016. REUTERS/Charles Mostoller
Democratic presidential candidate Hillary Clinton and Vice-President Joe Biden wave to neighbors as they stopped to visit Biden's childhood home in Scranton, Pennsylvania, August 15, 2016. REUTERS/Charles Mostoller
U.S. Vice President Joe Biden (L) and former Secretary of State Hillary Clinton (R) attend a ceremony to unveil a portrait honoring retiring Senate Minority Leader Harry Reid (D-NV) on Capitol Hill in Washington, U.S. December 8, 2016. REUTERS/Jonathan Ernst
Democratic presidential candidate Hillary Clinton and Vice-President Joe Biden campaign together during an event in Scranton, Pennsylvania, August 15, 2016. REUTERS/Charles Mostoller
U.S. Secretary of State Hillary Clinton (C) addresses a luncheon held in honor of German Chancellor Angela Merkel (L), as U.S. Vice President Joe Biden looks on at the State Department in Washington, June 7, 2011. REUTERS/Stelios Varias (UNITED STATES - Tags: POLITICS)
UNITED STATES - AUGUST 15: Democratic presidential nominee Hillary Clinton and Vice President Joe Biden conduct a campaign rally at Riverfront Sports in Scranton, Pa., August 15, 2016. (Photo By Tom Williams/CQ Roll Call)
Scranton, PA - AUGUST 15: Democratic Presidential nominee Hillary Clinton and US Vice President Joe Biden acknowledge the crowd at Riverfront Sports athletic facility on August 15, 2016 in Scranton, Pennsylvania. Hillary Clinton focused her speech on the economy and bringing jobs to the key swing state of Pennsylvania. (Photo by Mark Makela/Getty Images)
U.S. President Barack Obama delivers a statement on the Afghanistan-Pakistan Annual Review from the White House Briefing Room with Vice President Joe Biden (L) and Secretary of State Hillary Clinton looking on in Washington December 16, 2010. The review said "notable operational gains" had been made and Taliban momentum had been "arrested" in much of the country and reversed in some areas, but any gains were fragile and reversible. REUTERS/Kevin Lamarque (UNITED STATES - Tags: POLITICS CIVIL UNREST CONFLICT)
Combination images show U.S. Vice President Joe Biden and U.S. Secretary of State Hillary Clinton (R) sharing a laugh during the Lilly Ledbetter Fair Pay Act signing ceremony in the East Room of the White House in Washington, January 29, 2009. REUTERS/Jason Reed (UNITED STATES)
Orangeburg, UNITED STATES: Democratic presidential hopefuls (L-R) US Senator Joe Biden, US Senator Barack Obama and US Senator Hillary Rodham Clinton arrive at the Democratic Party Presidential Primary Debate, 26 April 2007, at South Carolina State University in Orangeburg, South Carolina. AFP PHOTO/Stan HONDA (Photo credit should read STAN HONDA/AFP/Getty Images)
Washington, UNITED STATES: US Democratic Senator from Nedw York Hillary Clinton (R) greets a member of Congress next to Democratic Senator from Delaware Joe Biden (C) as they arrives for US President George W. Bush's annual State of the Union address to a joint session of Congress at the Capitol in Washington 23 January 2007. AFP PHOTO/Larry Downing/Pool (Photo credit should read LARRY DOWNING/AFP/Getty Images)
U.S. President Barack Obama (2nd L) and Vice President Joe Biden (L), along with members of the national security team, receive an update on the mission against Osama bin Laden in the Situation Room of the White House, May 1, 2011. Also pictured are Secretary of State Hillary Clinton (2nd R) and Defense Secretary Robert Gates (R). Please note: A classified document seen in this photograph has been obscured at source. Picture taken May 1, 2011. A pivotal moment in the long, tortuous quest to find Osama bin Laden came years before U.S. spy agencies discovered his hermetic compound in Abbottabad, Pakistan. REUTERS/White House/Pete Souza/Handout (UNITED STATES - Tags: POLITICS CIVIL UNREST MILITARY IMAGES OF THE DAY) FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS. THIS IMAGE HAS BEEN SUPPLIED BY A THIRD PARTY. IT IS DISTRIBUTED, EXACTLY AS RECEIVED BY REUTERS, AS A SERVICE TO CLIENTS To match special report BINLADEN/KILL (SPECIAL REPORT)
Orangeburg, UNITED STATES: Democratic presidential hopefuls (L-R) US Senator Joe Biden, New Mexico Governor Bill Richardson, US Senator Hillary Rodham Clinton arrive at the Democratic Party Presidential Primary Debate, 26 April 2007, at South Carolina State University in Orangeburg, South Carolina. AFP PHOTO/Stan HONDA (Photo credit should read STAN HONDA/AFP/Getty Images)
Orangeburg, UNITED STATES: Democratic presidential hopefuls (L-R) US Senator Joe Biden, New Mexico Governor Bill Richardson, US Senator Hillary Rodham Clinton arrive at the Democratic Party Presidential Primary Debate, 26 April 2007, at South Carolina State University in Orangeburg, South Carolina. AFP PHOTO/Stan HONDA (Photo credit should read STAN HONDA/AFP/Getty Images)
Democratic presidential candidate U.S. Senator Hillary Clinton (D-NY)(L) and U.S. Senator Joe Biden (D-DE) speak after their debate at Howard University in Washington, June 28, 2007. REUTERS/Kevin Lamarque (UNITED STATES)
U.S. Senator Hillary Clinton (D-NY) (R) is greeted by U.S. Senator Joseph Biden (D-De) at a Democratic Presidential Candidates Forum sponsored by AFSCME in Carson City, Nevada, February 21, 2007. REUTERS/Kimberly White (UNITED STATES)
Democratic presidential candidate Hillary Clinton (D-NY) (L) and Senator Joe Biden (D-DE) listen as U.S. President George W. Bush delivers the final State of the Union address of his presidency in Washington January 28, 2008. REUTERS/Larry Downing (UNITED STATES)
U.S. Democratic presidential candidate Senator Hillary Clinton (D-NY) speaks while Senator Joe Biden (D-DE) listens during the AFL-CIO Presidential Forum at Soldier Field in Chicago, August 7, 2007. REUTERS/John Gress (UNITED STATES)
German Chancellor Angela Merkel (L) presents a gift to U.S. Secretary of State Hillary Clinton, as U.S. Vice President Joe Biden watches, during a luncheon held in Merkel's honor at the State Department in Washington June 7, 2011. REUTERS/Stelios Varias (UNITED STATES - Tags: POLITICS)
U.S. Vice President Joe Biden and U.S. Secretary of State Hillary Clinton talk during a meeting between U.S. President Barack Obama and Prime Minister Recep Tayyip Erdogan of Turkey in the Oval Office at the White House in Washington December 7, 2009. REUTERS/Kevin Lamarque (UNITED STATES POLITICS)
U.S. Vice President Joe Biden (C) speaks at the third annual U.S.-China Strategic and Economic Dialogue (S&ED) at the Department of the Interior in Washington May 9, 2011. Flanking Biden are Chinese Vice Premier Wang Qishan (L) and U.S. Secretary of State Hillary Clinton. REUTERS/Kevin Lamarque (UNITED STATES - Tags: BUSINESS POLITICS)
U.S. Secretary of State Hillary Clinton speaks to Vice President Joe Biden as U.S. Middle East envoy George Mitchell (R) looks on during a meeting between U.S. President Barack Obama and Palestinian President Mahmoud Abbas in the Oval Office of the White House in Washington May 28, 2009. REUTERS/Kevin Lamarque (UNITED STATES POLITICS)
U.S. Vice President Joe Biden (C), Indian Prime Minister Manmohan Singh (L) and U.S. Secretary of State Hillary Clinton toast during a luncheon at the State Department in Washington November 24, 2009. REUTERS/Yuri Gripas (UNITED STATES POLITICS)
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