President Trump has hired another lawyer in the wake of the ongoing investigation into alleged ties between his campaign and Russian election meddling.

Washington legal veteran John Dowd will join Marc Kasowitz, Michael Bowe and Jay Sekulow in representing the president in the investigation, a spokesman for the team said Friday, according to Reuters.

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Dowd has represented a number of high-profile clients in the past, including Sen. John McCain John Sidney McCainAnalysis: Biden victory, Democratic sweep would bring biggest boost to economy The Memo: Trump's strengths complicate election picture Mark Kelly: Arizona Senate race winner should be sworn in 'promptly' MORE (R-Ariz.) on congressional ethics charges in a banking scandal in the 1980s and 1990s. McCain was eventually cleared in the matter.

News of the Trump’s latest legal hire comes after the president revealed Friday on Twitter he was under investigation for firing FBI director James Comey.

I am being investigated for firing the FBI Director by the man who told me to fire the FBI Director! Witch Hunt — Donald J. Trump (@realDonaldTrump) June 16, 2017

Trump is not the only person in his administration who has hired outside counsel in recent days. Vice President Pence’s staff announced Thursday he hired Virginia attorney Richard Cullen to represent him in the investigation.

Trump’s personal lawyer Michael Cohen also reportedly hired D.C. attorney Stephen Ryan.