Rep. Chris Collins Christopher (Chris) Carl CollinsConspicuous by their absence from the Republican Convention NY Republican Chris Jacobs wins special election to replace Chris Collins 5 things to watch in Tuesday's primaries MORE (R-N.Y.), one of President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE's most ardent allies on Capitol Hill, on Thursday criticized the timing of the president's latest tweets attacking the investigation into Russian election meddling.

"I think timing could have been better on that, and I can't speak for the president, obviously he does what he does," Collins said. "Clearly, he's frustrated by the investigation, and the investigation is going to run its course, probably for many, many, many months."

"I'm not counseling the president, but I would have certainly not advised that that tweet go out today, because we're still very much reacting to yesterday's shooting," he added.

You are witnessing the single greatest WITCH HUNT in American political history - led by some very bad and conflicted people! #MAGA — Donald J. Trump (@realDonaldTrump) June 15, 2017

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Trump's tweets followed news reports that special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE was expanding his Russia investigation to look into the president for possibly attempting to obstruct justice. Mueller, a former FBI director, has been praised by lawmakers on both sides of the aisle as an uncompromising and fair law enforcement official.

In the postings, Trump said the investigation was being "led by some very bad and conflicted people."

The tweets also came as Capitol Hill reels from a Wednesday morning shooting in which a gunman opened fire at Republican lawmakers practicing for a charity baseball game in Alexandria, Va.

Five people were wounded in the attack, including House Majority Whip Steve Scalise Stephen (Steve) Joseph ScaliseHouse GOP slated to unveil agenda ahead of election House panel details 'serious' concerns around Florida, Georgia, Texas, Wisconsin elections Scalise hit with ethics complaint over doctored Barkan video MORE (R-La.), who underwent surgery and remains in critical condition. Trump visited Scalise in the hospital Wednesday night.

Trump called for unity in a statement following the shootings.