Graham: GOP will get 'slaughtered' if Trump nominee
© Getty Images

Sen. Lindsey GrahamLindsey Olin GrahamGraham: Trump can make GOP bigger, stronger, or he 'could destroy it' Sunday shows preview: Manchin makes the rounds after pivotal role in coronavirus relief debate Georgia DA investigating Trump taps racketeering expert for probe: report MORE (R-S.C.) argued Wednesday that if Donald TrumpDonald TrumpUS, South Korea reach agreement on cost-sharing for troops Graham: Trump can make GOP bigger, stronger, or he 'could destroy it' Biden nominates female generals whose promotions were reportedly delayed under Trump MORE is the GOP nominee, Republicans will get "slaughtered" in the November election. 

Lambasting the outspoken Republican front-runner as an "opportunist," Graham argued that Trump would kneecap Republicans' hopes of winning back the White House. 
 
"I think he's a kook. I think he's crazy. I think he's unfit for office," Graham, a backer of Trump rival Jeb Bush, said on Fox News's "America's Newsroom."
 
"I'm a Republican. and he's not. He's not a conservative Republican, he's an opportunist," Graham said on the program. "He's not fit to be president of the United States."
Trump pushed back against the broadside, sending several tweets arguing that Graham had no support before ending his own White House bid in December and "no cred" to make the claims.
 
"I will beat Hillary easily," Trump insisted in one of his tweets before going after Fox News for airing remarks from one of his critics on the program.