Former Labor Secretary Robert Reich, who served under President Clinton, floated four reasons this week that he said could justify an effort to impeach President Trump.

"By my count, there are now four grounds to impeach Trump. The fifth seems to be on its way," Reich tweeted alongside a screenshot of his reasons.

By my count, there are now four grounds to impeach Trump. The fifth seems to be on its way. pic.twitter.com/PfAw0a0hfU — Robert Reich (@RBReich) March 9, 2017

Reich, an outspoken supporter of Sen. Bernie Sanders Bernie SandersSenate Republicans signal openness to working with Biden Hillicon Valley: DOJ indicts Chinese, Malaysian hackers accused of targeting over 100 organizations | GOP senators raise concerns over Oracle-TikTok deal | QAnon awareness jumps in new poll Schumer, Sanders call for Senate panel to address election security MORE (I-Vt.) in the 2016 Democratic presidential primaries and a vocal critic of Trump, argued that Trump was " 'unfaithfully' executing his duties as president by accusing his predecessor, President Obama, of undertaking an illegal (and impeachable act)," alluding to Trump's claim that Obama wiretapped Trump Tower last year.

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The former Clinton administration official said Trump "making big money off of his Trump International Hotel," signing a revised executive order temporarily banning citizens from six Muslim-majority countries, and prioritizing news outlets that give him favorable media coverage are all grounds for impeachment.

Trump has faced questions over potential conflicts of interest surrounding his business empire, control of which was handed over to his two adult sons, Donald Jr. and Eric, while the rest of his assets were placed in a blind trust. Many have criticized the trust, saying it does not effectively deter potential conflicts of interest.

Trump's attorney also said at a press conference that Trump would give any hotel profits originating from a foreign government to the U.S. Treasury.

The president has also come under fire for his executive order on immigration and over White House press secretary Sean Spicer holding a press "gaggle" — an informal, off-camera briefing — last month with select outlets.

Reich also said "evidence is mounting that Trump colluded with Russian operatives to win the 2016 presidential election," which he listed as a fifth potential reason to impeach Trump.

"The question is no longer whether there are grounds to impeach Trump. The practical question is whether there is the political will. As long as Republicans remain in the majority in the House (where a bill of Impeachment originates), it's unlikely," Reich continued.