Rep. Ruben Gallego Ruben GallegoHispanic caucus report takes stock of accomplishments with eye toward 2021 Senators call on Pentagon to reinstate funding for Stars and Stripes newspaper Hispanic Caucus campaign chief to mount leadership bid MORE (D-Ariz.) on Thursday morning joined a growing list of House Democrats calling to open an impeachment inquiry into 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.

"No president in the history of our country has ever been subject to as many credible allegations of illegal conduct as Donald Trump," Gallego said in a speech on the House floor. “Given the serious nature of these crimes and the president’s refusal to cooperate with congressional investigations, it’s time for the House of Representatives to begin an impeachment inquiry."

The congressman said former 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's report documents "compelling evidence" that Trump obstructed justice, and noted that despite the "strong evidence" Mueller was prohibited from considering bringing charges against a sitting president due to Department of Justice policies.

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“So, Congress has a responsibility to act up where Mueller left off," Gallego said.

"It honors the process that our Founding Fathers enshrined in our Constitution to empower Congress to investigate and hold the president accountable for committing high crimes and misdemeanors," he said.

There are now more than 80 House Democrats backing a Trump impeachment inquiry. Speaker Nancy Pelosi Nancy PelosiPelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' On The Money: Anxious Democrats push for vote on COVID-19 aid | Pelosi, Mnuchin ready to restart talks | Weekly jobless claims increase | Senate treads close to shutdown deadline Trump signs largely symbolic pre-existing conditions order amid lawsuit MORE (D-Calif.) has repeatedly rejected liberal calls to impeach the president, pointing to the lack of support for such a move in the GOP-controlled Senate.

Gallego said the inquiry shouldn't be limited to the findings in the Mueller report.

With all Trump's "tweets and daily distractions," Congress can't lose sight of the "much broader scope of Trump’s alleged wrongdoing," he said.

Gallego also pointed out that more than a dozen women have accused the president of sexual assault or harassment.

The congressman went on to highlight allegations of campaign finance violations, including hush money payments, illegal foreign contributions to the inaugural committee, misuses of the Trump Foundation charity for personal and political purposes, welcoming foreign interference in U.S. elections and abusing security clearance process.

"And we shouldn’t overlook how inappropriate it is for the president of the United States to engage in constant, daily lying. The list unfortunately goes on and on," he said.

“As a Marine and as a member of Congress, I swore to protect the Constitution of the Unites States, and I will not stand by as Donald Trump erodes the rule of law and our democracy," Gallego added.