Billionaire environmentalist Tom Steyer argued Friday congressional Republicans should use the same criteria they used 20 years ago for President Bill Clinton and impeach President Trump.

Citing arguments made by Rep. Bob Goodlatte, R-Va., while impeaching Clinton, Steyer said Trump should be impeached for obstruction of justice and lying to the American people.

"The president of the United States has admitted firing an FBI Director over an investigation into Russian election interference on his behalf — the most serious foreign attack on American democracy since our nation's founding," Steyer wrote in a blog post.

"We must demand answers to many grave questions arising from this crisis, but the most urgent is this: How are Congressional Republicans going to hold to account a president whose efforts to obstruct an FBI investigation clearly meet the standards for impeachment articulated by Congressional Republicans fewer than twenty years ago?"

Steyer, who has sought to use his money to push environmentalist candidates in elections across the country, now appears to be branching out into more general federal politics with his statements about Trump. Steyer ripped Trump and accused him of treason in the wake of Trump's announcement that he would withdraw the United States from the Paris Agreement on climate change.

In his blog post, Steyer recounted the arguments against Presidents Richard Nixon and Bill Clinton during their impeachment proceedings. He said he found many similarities between the ways those presidents flouted the truth and Trump's recent dealings.

"While there is much that requires further investigation, we cannot continue to stick our heads in the sand in avoidance of what is already known. Impeachment of an elected president is an act of enormous magnitude that must not be undertaken lightly or in response to routine political disagreements or policy differences," Steyer wrote.

"But the seriousness of the remedy speaks not only to the danger of its misuse, but to the importance of using it when appropriate. Our system depends on trust and goodwill. Breaking of norms and disregard for decency have huge, long-term costs. No one can be immune from our laws; everyone must be held to account. If Congress does not uphold that principle, it will have done more damage to our democracy than Russia could ever hope to."