FBI Director Christopher Wray testified about Porter before the Senate Intelligence Committee.
The attorney general said the FBI and Justice Department needed to gain back the country's "confidence."
Trump has said the FBI disliked Comey, but the emails suggest otherwise.
Bowdich was associate deputy director under Comey and was involved in the response to the San Bernardino shooting.
Trump and his allies had scrutinized McCabe for campaign contributions his wife once received.
President questioned top FBI lawman on how he voted, raising concerns amongst former officials.
After Christopher Wray’s threat, the attorney general apparently backed off from his call to fire Andrew McCabe.
Andrew McCabe has been a target of both Jeff Sessions and President Donald Trump.
Trump and other Republicans have accused Andrew McCabe of misconduct.
"Wray needs to do his job and tell all of them to cut it out. If Wray can’t do that he should resign," Richard Painter tweeted.
Public figures including John Brennan and Joe Scarborough have said they donated.
The president spoke at the FBI Academy in Quantico.
Wray appeared before the House Judiciary Committee after Trump said the reputation of the bureau was "in tatters.”
Representative Matt Gaetz and others are calling for answers about Comey’s handling of the Clinton emails probe.
The assessment, from August, blamed “perceptions of police brutality” for violence against officers.
Speaking at the National September 11 Memorial and Museum, Wray also made comments about the Las Vegas mass shooting.
Attorney General Jeff Sessions will attend instead of the president.
Senators Chuck Grassley and Lindsey Graham of the Senate Judiciary Committee detailed the information in a letter to new FBI Director Christopher Wray.
Senator Chuck Grassley, chairman of the Senate Judiciary Committee, has championed the accusation involving Andrew McCabe for months
The favorable recommendation was expected as more than half of committee members had publicly expressed support for Wray.
Since 1972, the average length of time between the nomination and confirmation of a director has been 20 days, excluding the special second appointment of Robert Mueller.
“My loyalty is to the Constitution and to the rule of law,” Wray told the committee.
Trump’s pick to succeed James Comey appeared for his confirmation hearing before the Senate Judiciary Committee.