"Impeachments have to be based on proof, not presumptions, that's the problem when you move towards impeachment on this abbreviated schedule that has not been explained to me, 'why you want to set the record for the fastest impeachment?'," Professor Turley said.
Turley went on to say that President Trump is 'allowed' to go to the courts and said that former President Richard Nixon resigned after the Supreme Court ruled against him.
Turley has written opinion columns arguing that Democrats have moved too quickly, focused too narrowly on Trump's relations with Ukraine, and suffered from the lack of testimony from people who were directly involved, like Rudy Giuliani.
Other constitutional law experts called by Democrats also testified on Wednesday that President Donald Trump's actions concerning Ukraine represented impeachable offenses as the House of Representatives Judiciary Committee began proceedings expected to end in charges against Trump.
A law professor selected by Trump's fellow Republicans said that the impeachment inquiry lacked testimony from people with direct knowledge of the events and that current evidence did not show that Trump had committed "a clear criminal act." The hearing featured political theatrics.
From the outset, Republicans repeatedly tried to interrupt the proceedings by raising objections and points of order.
One of the three professors called by the Democrats told the committee's top Republican, Doug Collins, she felt insulted by his remarks.
The impeachment inquiry launched by the Democratic-led House in September focuses on the Republican president's request for Ukraine to conduct investigations that could harm Democratic political rival Joe Biden.
The Judiciary Committee heard from the four law professors during its first hearing to examine whether Trump's actions qualify as the "high crimes and misdemeanors" punishable by impeachment under the U.S. Constitution.
If the House approves articles of impeachment - formal charges - then Senate then would hold a trial on whether to remove Trump from office.