Republicans are expressing growing concern that President Trump's voluble communication style is becoming a liability that could get him into trouble at a time when controversy swirls around the White House.

Sen. Lindsey Graham Lindsey Olin GrahamSteele Dossier sub-source was subject of FBI counterintelligence probe Hillicon Valley: Subpoenas for Facebook, Google and Twitter on the cards | Wray rebuffs mail-in voting conspiracies | Reps. raise mass surveillance concerns Key Democrat opposes GOP Section 230 subpoena for Facebook, Twitter, Google MORE (R-S.C.) during a Sunday show appearance expressed frustration over Trump discussing the FBI’s investigation into Russian election interference, saying it detracts from his agenda. A special counsel continues the probe into Russia’s meddling in the United States presidential election.

“You may be the first president in history to go down because you can't stop inappropriately talking about an investigation that if you just were quiet, would clear you,” Graham said on CBS’s “Face the Nation.”

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Graham’s comments came hours after Trump on Twitter said it was “cowardly” for former FBI Director James Comey to leak written memos of their conversations.

“It’s frustrating for me to want to help a man who I think will do big things no other Republican would do, like immigration,” Graham added.

Comey last week testified that Trump during a private meeting asked him to “let go” of the bureau’s probe into former national security adviser Michael Flynn. Trump’s lawyer denied this claim in a statement following Comey’s testimony.

The day after Comey’s testimony, Trump called Comey “a leaker” and said he felt “total and complete vindication” after the former FBI chief appeared in front of the Senate Intelligence Committee.

“Despite so many false statements and lies, total and complete vindication...and WOW, Comey is a leaker!” Trump said.

Ari Fleischer, who served as former President George W. Bush’s press secretary, also cautioned that Trump should “stop talking” because it could lead to “a perjury trap.”

“Advice 4 POTUS: You have not been vindicated. U won't be unless Bob Mueller says so. Stop talking. You're heading into a giant perjury trap,” Fleischer wrote on Twitter Sunday morning.

Republican lawmakers in the wake of Comey’s testimony have described Trump’s conversations with the former FBI director as “inappropriate,” but stopped short of saying the president obstructed justice.

“So this looks more like an inappropriate conversation than obstruction,” Sen. James Lankford (R-Okla.) told CBS's John Dickerson on Sunday.

Sen. Susan Collins Susan Margaret CollinsThe Hill's Campaign Report: Trump faces backlash after not committing to peaceful transition of power Billionaire who donated to Trump in 2016 donates to Biden Credit union group to spend million on Senate, House races MORE (R-Maine) also said Trump should not have discussed the FBI’s investigation into Flynn with Comey.

“The conversation should not have occurred. There’s no doubt about it,” she told CNN’s “State of the Union.”

Trump’s Twitter habit has also earned him criticism. Recently, he used Twitter to pick an international fight with London Mayor Sadiq Khan following the London terror attacks. He also insisted upon calling his executive order restricting some travelers from entering the United States a “travel ban” in defiance of his own lawyers.

Trump’s team argues that his use of Twitter promotes "democratization of information."

“His social media platform is incredibly powerful — him cutting out the middle man has angered the middle man, but that’s OK," White House counselor Kellyanne Conway said last week.