Ousted Veterans Affairs Secretary David Shulkin David Jonathon ShulkinVA inspector general says former top official steered M contract to friend Schumer demands answers in use of unproven coronavirus drug on veterans Former Trump VA secretary says staffer found plans to replace him in department copier MORE said Thursday that he was fired because President Trump Donald John TrumpBubba Wallace to be driver of Michael Jordan, Denny Hamlin NASCAR team Graham: GOP will confirm Trump's Supreme Court nominee before the election Southwest Airlines, unions call for six-month extension of government aid MORE was unhappy with the pace of improvements at the agency.

In an interview with Fox News, Shulkin said he agreed with Trump's perception that the department was not doing enough to improve wait times for veterans seeking care at VA hospitals around the country.

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"He wasn't happy with the pace and you know, I agree with POTUS. This is [an] organization that needs to change, it needs to do better at its job and we all want to do it faster and better," Shulkin told Fox News's Bret Baier.

Shulkin also defended his firing, saying that the president had the right to surround himself with people he thinks can do the job best.

"Every Cabinet member serves at the pleasure of the president and it's the president's prerogative to have a team around him that he thinks is doing the job," said Shulkin.

Shulkin was ousted Wednesday by Trump, who appointed White House physician and Navy doctor Adm. Ronny Jackson to lead the agency, where Shulkin had reportedly been growing increasingly isolated from top aides for months.

In an op-ed after his firing, the former top VA official who was originally appointed during the Obama administration blasted the "toxic" and "chaotic" culture in Washington, D.C.

"As I prepare to leave government, I am struck by a recurring thought: It should not be this hard to serve your country," Shulkin wrote in The New York Times.

Trump, meanwhile, praised Shulkin's service to the country in a series of tweets announcing Jackson's appointment.

"I am thankful for Dr. David Shulkin’s service to our country and to our GREAT VETERANS!" the president tweeted Wednesday.