ABC late-night host Jimmy Kimmel on Monday mocked President Trump's "working vacation," joking that "ordering Chris Christie to go on a White Castle run doesn’t count as a meeting."

"I want to apologize to the president for thinking the vacation is a vacation when plainly it is not," Kimmel said in his opening monologue. "It's right there. He said 'meetings and calls.' He's working. Just yesterday worked a peace deal between a ground's keeper at the golf course and some gophers."

"He tweeted again today he's not on vacation. Working hard from New Jersey while White House is under renovation," Kimmel continued.

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"Just for the record, ordering Chris Christie to go on a White Castle run doesn't count as a meeting," he added, referring to New Jersey's Republican governor.

Trump began the 17-day stay at Trump National Golf Club in Bedminster, N.J., on Thursday afternoon.

The president spoke with South Korean President Moon Jae-in on Sunday evening as tensions with North Korea continue to mount.

“Just completed call with President Moon of South Korea. Very happy and impressed with 15-0 United Nations vote on North Korea sanctions,” Trump tweeted to his 35.3 million followers.

The president's pushback on the characterization of his 17-day trip as a vacation appears to be a response to those pointing out Trump's criticism of former President Barack Obama Barack Hussein ObamaWith low birth rate, America needs future migrants 4 ways Hillary looms over the 2020 race Obama goes viral after sporting black bomber jacket with '44' on sleeve at basketball game MORE's vacations while in office.

The president will meet with Secretary of Health and Human Services Tom Price Thomas (Tom) Edmunds PriceIs a presidential appointment worth the risk? Former Ryan aide moves to K street Grassley to test GOP on lowering drug prices MORE for a briefing on the opioid crisis on Tuesday, according to the White House.