Sen. Lindsey Graham (R-S.C.) on Wednesday urged President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE not to abandon infrastructure talks with congressional Democrats after the president declared he would not work with them until their investigations are over.

"My advice to the President is to try to find solutions to problems like infrastructure, prescription drugs, and a broken immigration system," Graham, a staunch ally of the president, tweeted. “See if we can do two things at once -- fight with each other and find common ground.”

In a series of tweets Wednesday afternoon, Graham expressed sympathy for Trump after the president attacked House investigations, saying he had “never seen anybody treated this way.”

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Still, he urged Trump to “rise above it if you can,” arguing the president could push back against the Democratic House majority while still continuing to work with them on other issues.

Referring back to Supreme Court Justice Brett Kavanaugh Brett Michael KavanaughHarris faces pivotal moment with Supreme Court battle Poll: 59 percent think president elected in November should name next Supreme Court justice Feinstein 'surprised and taken aback' by suggestion she's not up for Supreme Court fight MORE’s confirmation hearings, when Graham made headlines for his fiery defense of Kavanaugh against allegations of sexual assault, Graham tweeted, “I didn’t like what happened. But I'm still showing up and still trying to find common ground.”

Trump earlier Wednesday abruptly ended a meeting with congressional Democrats at the White House that had been scheduled to focus on locking down an infrastructure deal. The president later blasted Speaker Nancy Pelosi Nancy PelosiHoyer: House should vote on COVID-19 aid — with or without a bipartisan deal Ruth Bader Ginsburg lies in repose at Supreme Court McCarthy threatens motion to oust Pelosi if she moves forward with impeachment MORE (D-Calif.) after she accused him of engaging in a “cover-up,” saying that Democrats must end "phony investigations" into his administration before talks can resume.

Graham is up for reelection in 2020 and has emerged as one of Trump’s most vocal defenders in Congress. On issues where he has broken with Trump, the GOP senator has taken a conciliatory tone, saying in March that Trump should stop insulting the late Sen. John McCain John Sidney McCainThe Memo: Trump's strengths complicate election picture Mark Kelly: Arizona Senate race winner should be sworn in 'promptly' Cindy McCain: Trump allegedly calling war dead 'losers' was 'pretty much' last straw before Biden endorsement MORE (R-Ariz.), a close friend of Graham’s, because the remarks “hurt him more than they hurt the legacy of Sen. McCain.”