White House press secretary Sarah Sanders rebuffed Sen. Bob Corker's, R-Tenn., criticisms of President Trump and said the president has been an "incredibly strong leader on foreign policy and national security."

"Sen. Corker is certainly entitled to his own opinion, but he's not entitled to his own facts," Sanders told reporters during Tuesday's White House press briefing. "The fact is this president has been an incredibly strong leader on foreign policy and national security. And he's been a leader on this front, and I think that's been seen and demonstrated time and time again since he took office."

Sanders praised the president's work on dealing with North Korea, including sanctions against the rogue regime passed by the United Nations Security Council, his strategy to combat ISIS, and his demands for NATO allies to "pay their fair share."

"His vision of principled realism is creating calm around the world and defeating our enemies," she said. "Again, Sen. Corker may have an opinion but the facts don't lie. The president has been very successful on this front."

The president fired off a series of tweets on Sunday about Corker and said the Tennessee senator "begged" Trump to endorse him before he decided to retire. Trump also said Corker "didn't have the guts" to run for a third term, and said he "gave us the Iran Deal."

Corker responded to Trump on Twitter and said the White House "has become an adult day care center."

"Someone obviously missed their shift this morning," he continued.

Corker continued to speak out against Trump in an interview with the New York Times on Sunday and warned the president was setting the U.S. on "the path to World War III" with his tweets."

The Tennessee senator also said Trump "concerns me."

In the wake of Corker's criticisms, former White House chief strategist Steve Bannon said the Tennessee Republican should resign.

When asked if Trump agrees with Bannon, Sanders said that's a "decision for Sen. Corker and the people of Tennessee, not for us, to decide."

Sanders also defended Trump's statement about Corker's role in the Iran nuclear deal and said he "rolled out the red carpet" for the agreement.

"Sen. Corker worked with Nancy Pelosi and the Obama administration to pave the way for that legislation," she said.