"No final straw", he said aboard Air Force One.
"I made those comments during my time working on the Rubio presidential campaign", Wheeler said in a statement to The Hill.
"He'll go on to great things and he's going to have a wonderful life, I hope", Trump said. Pruitt has been the subject of continued ethics scandals over a number of months but the president had previously stood by a man who had overseen his administration's rolling back of Obama-era environmental regulations. Environmental groups expressed dismay when he joined the federal agency, and Pruitt has since sought to roll back various environmental regulations, including Obama-era vehicle emission standards.
Republican Senator Jim Inhofe, from Pruitt's home state of Oklahoma, praised Pruitt's efforts to cut red tape for industry.
Wheeler "has the potential to be just as destructive", said Michael Mikulka, president of the American Federation of Government Employees Local 704.
Over the past few months, Pruitt has become somewhat of a political liability for the Trump administration, drawing the scrutiny of federal investigators and even prompting criticism from the EPA's ethics officer Kevin Minoli.
Pruitt quit following a series of revelations involving pricey trips with first-class airline seats and unusual security spending, including a $43,000 soundproof booth for making private phone calls. But he told The Washington Post, which first uncovered the blog post previous year, that he came to support Trump later in 2016, after Rubio exited the race, when Trump spoke at an event hosted by coal mining company Murray Energy Corp., one of his lobbying clients.
"Scott Pruitt's departure is long overdue. We'll give him the opportunity to tell his side of the story". The Washington Post reported Pruitt had aides try to get her a job at the Republican Attorneys General Association with a salary topping $200,000 per year.