Sen. John McCain John Sidney McCainGOP lobbyists worry Trump lags in K Street fundraising Mark Kelly kicks off Senate bid: ‘A mission to lift up hardworking Arizonans’ Gabbard hits back at Meghan McCain after fight over Assad MORE (R-Ariz.) is accusing Democrats of torpedoing former Sen. Joe Lieberman’s (I-Conn.) chances at becoming FBI director.

“My Democratic colleagues clearly did [kill Lieberman’s chances],” McCain told reporters Wednesday, according to CNN.

"This is their nominee for vice president of the United States. If anything would make you cynical about this town, that’s it," he said.

Lieberman is reportedly no longer the frontrunner to become the next FBI director after President Trump indicated last week that he was leaning toward the former Democratic-turned-Independent senator.

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An administration official told CNN this week that Trump wants to see a broader list of candidates.

Lieberman served as a Democrat for nearly two decades — including serving as Al Gore Albert (Al) Arnold GoreOvernight Energy: Trump ends talks with California on car emissions | Dems face tough vote on Green New Deal | Climate PAC backing Inslee in possible 2020 run New climate PAC will back Inslee for president Howard Schultz must run as a Democrat for chance in 2020 MORE's presidential running mate in 2000 — before becoming an Independent in 2006.

Democratic senators argued Lieberman lacked the same background in federal law enforcement previous FBI directors possessed.

Lieberman is also a partner at the same law firm as Marc Kasowitz, whom Trump is expected to retain to lead a team of private attorneys to represent him amid the federal probe into possible coordination between his campaign team and Russia.

Still, the administration official told CNN that Lieberman’s ties to Kasowitz did not affect Trump’s decision.

Trump is under pressure from Congress to pick a new FBI director with strong bipartisan credentials after he abruptly fired James Comey as FBI chief earlier this month. Comey was leading the FBI's Russia probe involving Trump's campaign before he was fired.

Several candidates have dropped out of consideration for the top FBI spot, including Senate Majority Whip John Cornyn John CornynGOP lawmaker says panel to investigate drug company gaming of patent system Senators grill drug execs over high prices Cornyn less popular than Cruz in Texas: poll MORE (R-Texas) and Rep. Trey Gowdy Harold (Trey) Watson GowdyThe family secret Bruce Ohr told Rod Rosenstein about Russia case Trey Gowdy joins Fox News as a contributor Congress must take the next steps on federal criminal justice reforms MORE (R-S.C.).