Graham warns Giuliani: 'I hope you know what you're talking about'

Sen. Lindsey GrahamLindsey Olin GrahamCampaigns pivot toward health awareness as races sidelined by coronavirus UK Prime Minister Boris Johnson tests positive for coronavirus Schumer: Senate should 'explore' remote voting if coronavirus sparks lengthy break MORE (R-S.C.) warned on Wednesday that if Rudy GiulianiRudy GiulianiCuomo steps into national spotlight with coronavirus fight Hannity offers to help Cuomo in coronavirus response with radio, television shows The Hill's Campaign Report: Officials in spotlight over coronavirus response MORE, President TrumpDonald John TrumpTrump orders US troops back to active duty for coronavirus response Trump asserts power to decide info inspector general for stimulus gives Congress Fighting a virus with the wrong tools MORE's personal lawyer, is going to publicly suggest a "cover-up" involving the Bidens and Ukraine "then I hope you know what you're talking about.”

Graham’s comments come after Giuliani took a trip to Ukraine this month and met with a host of former and current officials as part of an effort to unearth more dirt on Trump's political rivals, including 2020 presidential candidate Joe BidenJoe BidenFighting a virus with the wrong tools Trump bucks business on Defense Production Act Overnight Health Care — Presented by PCMA — US coronavirus cases hit 100,000 | Trump signs T stimulus package | Trump employs defense powers to force GM to make ventilators | New concerns over virus testing MORE.

Trump’s efforts to get Kyiv to announce investigations into the Biden family and unfounded accusations that Ukraine interfered in the 2016 elections are at the center of Democrats’ impeachment efforts against him.

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"I don't know what Rudy's got, but I'm going to send him a letter. If you're going to go on national television and tell the country that you've found evidence of a cover-up, then I hope you know what you're talking about,” Graham told reporters.

"I like Rudy a lot, but we're going to have to watch what we say,” he added.

Graham has invited Giuliani to testify before the Senate Judiciary Committee over his concerns about corruption in Ukraine. He reiterated on Wednesday that Trump’s lawyer has an “open invitation” before the panel he chairs. 

"If he comes, you gotta be willing to ask questions about your conduct. It's just not good for the country to make these accusations on cable television without them being tested,” Graham added. 

Giuliani told The Washington Post that Trump has asked him to brief GOP senators and the Justice Department on his findings in Ukraine. A source told The Wall Street Journal that Giuliani told the president that his recent trip produced "more than you can imagine."  

Trump and his allies have latched onto Hunter Biden's connection to Ukraine, where he served on the board of an energy company, as the former vice president seeks the Democratic nomination to challenge Trump in 2020. There's no indication Joe Biden was acting with his son's interests in mind when he called for the ouster of a Ukrainian prosecutor accused of corruption, and the former vice president has denied any such motivations.