Sen. Lindsey Graham jokes about 'bat**** crazy' GOP

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Sen. Lindsey Graham Roasts Republican Candidates

WASHINGTON, D.C. — Sen. Lindsey Graham mocked all of his former rivals in the Republican race to replace President Barack Obama on Thursday night, joking that his "party has gone bat**** crazy."

Speaking at the Washington Press Club Foundation Dinner, Graham had the harshest words for Sen. Ted Cruz. "If you kill Ted Cruz on the floor of the Senate, and the trial was in the Senate, nobody could convict you," he quipped.

Related: Rubio, Cruz Put Aside Differences and Gang Up on Trump

Graham also went after Sen. Marco Rubio, calling him "the boy wonder," adding: "I'm not saying he would change his positions, but he would change his positions. The Secret Service's main job if he's president is to keep him hydrated."

See more images from Thursday night's debate:

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Sen. Lindsey Graham jokes about 'bat**** crazy' GOP
Republican presidential candidate, retired neurosurgeon Ben Carson, left and Republican presidential candidate, businessman Donald Trump talk at a break during a Republican presidential primary debate at The University of Houston, Thursday, Feb. 25, 2016, in Houston. (AP Photo/David J. Phillip)
Republican presidential candidate, Sen. Marco Rubio, R-Fla., looks on during a Republican presidential primary debate at The University of Houston, Thursday, Feb. 25, 2016, in Houston. (AP Photo/David J. Phillip)
Republican presidential candidate, Sen. Ted Cruz, R-Texas, looks on during a Republican presidential primary debate at The University of Houston, Thursday, Feb. 25, 2016, in Houston. (AP Photo/David J. Phillip)
Republican presidential candidate, retired neurosurgeon Ben Carson speaks during a Republican presidential primary debate at The University of Houston, Thursday, Feb. 25, 2016, in Houston. (AP Photo/David J. Phillip)
Republican presidential candidate, Ohio Gov. John Kasich, right, speaks as Republican presidential candidate, businessman Donald Trump, left, and Republican presidential candidate, Sen. Ted Cruz, R-Texas, center, react during a Republican presidential primary debate at The University of Houston, Thursday, Feb. 25, 2016, in Houston. (AP Photo/David J. Phillip)
HOUSTON, TX - FEBRUARY 25: Ohio Gov. John Kasich walks onstage before the Republican presidential debate at the Moores School of Music at the University of Houston on February 25, 2016 in Houston, Texas. The debate is the last before the March 1 Super Tuesday primaries. (Photo by Michael Ciaglo-Pool/Getty Images )
HOUSTON, TX - FEBRUARY 25: Donald Trump (L) answers a question as Sen. Ted Cruz (R-TX) looks on during the Republican presidential debate at the Moores School of Music at the University of Houston on February 25, 2016 in Houston, Texas. The debate is the last before the March 1 Super Tuesday primaries. (Photo by Michael Ciaglo-Pool/Getty Images )
HOUSTON, TX - FEBRUARY 25: Sen. Ted Cruz (R-TX) walks onstage before the Republican presidential debate at the Moores School of Music at the University of Houston on February 25, 2016 in Houston, Texas. The debate is the last before the March 1 Super Tuesday primaries. (Photo by Michael Ciaglo-Pool/Getty Images )
HOUSTON, TX - FEBRUARY 25: Republican presidential candidates Sen. Marco Rubio (R-FL) (L) and Ted Cruz (R-TX)(R) listen as Donald Trump answers a question during the Republican presidential debate at the Moores School of Music at the University of Houston on February 25, 2016 in Houston, Texas. The debate is the last before the March 1 Super Tuesday primaries. (Photo by Michael Ciaglo-Pool/Getty Images )
HOUSTON, TX - FEBRUARY 25: Ohio Gov. John Kasich speaks at the Republican presidential debate at the Moores School of Music at the University of Houston on February 25, 2016 in Houston, Texas. The debate is the last before the March 1 Super Tuesday primaries. (Photo by Michael Ciaglo-Pool/Getty Images )
HOUSTON, TX - FEBRUARY 25: Ben Carson speaks during the Republican presidential debate at the Moores School of Music at the University of Houston on February 25, 2016 in Houston, Texas. The debate is the last before the March 1 Super Tuesday primaries. (Photo by Michael Ciaglo-Pool/Getty Images )
US Republican Presidential Candidate Ted Cruz is seen on television in the CNN filing room during the Republican Presidential Debate at the University of Houston in Houston, Texas on February 25, 2016. / AFP / Thomas B. Shea (Photo credit should read THOMAS B. SHEA/AFP/Getty Images)
Republican presidential candidate, businessman Donald Trump, center, speaks as Republican presidential candidate, Sen. Marco Rubio, R-Fla., left, and Republican presidential candidate, Sen. Ted Cruz, R-Texas, right, look on during a Republican presidential primary debate at The University of Houston, Thursday, Feb. 25, 2016, in Houston. (AP Photo/David J. Phillip)
US Republican Presidential Candidate Donald Trump is seen on television in the CNN filing room during the Republican Presidential Debate at the University of Houston in Houston, Texas on February 25, 2016. / AFP / Thomas B. Shea (Photo credit should read THOMAS B. SHEA/AFP/Getty Images)
Republican presidential candidate, Sen. Marco Rubio, R-Fla., left, and Republican presidential candidate, businessman Donald Trump both speak during a Republican presidential primary debate at The University of Houston, Thursday, Feb. 25, 2016, in Houston. (AP Photo/David J. Phillip)
Republican presidential candidate, Ohio Gov. John Kasich speaks during a Republican presidential primary debate at The University of Houston, Thursday, Feb. 25, 2016, in Houston. (AP Photo/David J. Phillip)
Republican presidential candidate, businessman Donald Trump speaks during a Republican presidential primary debate at The University of Houston, Thursday, Feb. 25, 2016, in Houston. (AP Photo/David J. Phillip)
From left, Sen. Marco Rubio, R-Fla., businessman Donald Trump and Sen. Ted Cruz, R-Texas prepare for a Republican presidential primary debate at The University of Houston, Thursday, Feb. 25, 2016, in Houston. (AP Photo/David J. Phillip)
As Republican presidential candidate, businessman Donald Trump, center, speaks, Republican presidential candidates, retired neurosurgeon Ben Carson, left, Sen. Marco Rubio, R-Fla., second from left, Sen. Ted Cruz, R-Texas, second from right and Ohio Gov. John Kasich, right, look on during a Republican presidential primary debate at The University of Houston, Thursday, Feb. 25, 2016, in Houston. (AP Photo/David J. Phillip)
HOUSTON, TX - FEBRUARY 25: Republican presidential candidates Florida Sen. Marco Rubio (R-FL), Donald Trump, Texas Sen. Ted Cruz (R-TX) (L-R) stand on stage ater being introduced for the Republican National Committee Presidential Primary Debate at the University of Houston's Moores School of Music Opera House on February 25, 2016 in Houston, Texas. The candidates are meeting for the last Republican debate before the Super Tuesday primaries on March 1. (Photo by Scott Halleran/Getty Images)
From left, Republican presidential candidates, retired neurosurgeon Ben Carson, Sen. Marco Rubio, R-Fla., businessman Donald Trump, Sen. Ted Cruz, R-Texas, and Ohio Gov. John Kasich listen to the U.S. national anthem before a Republican presidential primary debate at The University of Houston, Thursday, Feb. 25, 2016, in Houston. (AP Photo/David J. Phillip)
Moderator Wolf Blitzer (L) and US Republican Presidential Candidates (L-R) Ben Carson , Marco Rubio , Donald Trump, Ted Cruz and John Kasich prepare for the Republican Presidential Debate at the University of Houston in Houston, Texas on February 25, 2016. / AFP / Thomas B. Shea (Photo credit should read THOMAS B. SHEA/AFP/Getty Images)
HOUSTON, TX - FEBRUARY 25: Workers prepare for the Republican presidential candidates to meet at the Moores School of Music at the University of Houston on February 25, 2016 in Houston, Texas. The debate is the last before the March 1 Super Tuesday primaries. (Photo by Michael Ciaglo-Pool/Getty Images )
HOUSTON, TX - FEBRUARY 25: Donald Trump (L) and Sen. Ted Cruz (R-TX) talk over each other in the Republican presidential debate at the Moores School of Music at the University of Houston on February 25, 2016 in Houston, Texas. The debate is the last before the March 1 Super Tuesday primaries. (Photo by Michael Ciaglo-Pool/Getty Images )
HOUSTON, TX - FEBRUARY 25: Moderator Wolf Blitzer of CNN listens to the answers to a question during the Republican presidential debate at the Moores School of Music at the University of Houston on February 25, 2016 in Houston, Texas. The debate is the last before the March 1 Super Tuesday primaries. (Photo by Michael Ciaglo-Pool/Getty Images)
Republican presidential candidate, Ohio Gov. John Kasich speaks during a Republican presidential primary debate at The University of Houston, Thursday, Feb. 25, 2016, in Houston. (AP Photo/David J. Phillip)
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The South Carolina native compared Obama's African roots to Cruz's background. "I will say that our Canadian is better than your Kenyan," he joked. "I know exactly when Ted is going to drop out of the race. March 12 — that's Canadian week in Myrtle Beach, when all of our Canadian friends get 10 percent off."

Referring to the late euthanasia activist, Graham ended his remarks by calling himself the "Dr. [Jack] Kevorkian of the Republican party" because his bid for president failed, and then he endorsed Jeb Bush, who subsequently dropped out.

In an apparent bid to curse the GOP frontrunner, Graham then donned a "Make America Great Hat" and quipped: "I endorse Donald Trump and hope the Graham magic still exists!"

WATCH: Sen. Lindsey Graham goads Donald Trump in baseball cap:

Sen. Lindsey Graham Goads Donald Trump in Baseball Cap

Democratic Sen. Barbara Boxer also joined the fun at the event.

"Have you seen Bernie Sanders' rallies? I haven't seen that many white voters since the Oscars," she joked.

Related: So Long to Lindsey Graham's One-Liners

House Minority Leader Nancy Pelosi joined Graham by weighing in on the Calgary, Alberta-born Cruz's White House bid.

"People are always saying that members of Congress from opposite parties should spend more time after work like we used to do," Pelosi said. "It would be fun to spend more time with Ted Cruz. Don't you think? ... Somewhere where he feels right at home. A Justin Bieber concert, a Toronto Blue Jays baseball game, a maple syrup tasting."

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