President Trump on Tuesday wished Kim Jong Un “good luck,” amid reports that North Korea's authoritarian leader may be facing a health crisis after cardiovascular surgery.

"I just have to say to Kim Jong Un, good luck," Trump told reporters during a White House press briefing. "I've had a very good relationship with him. I can only say this, I wish him well."

Some U.S. officials have even claimed that Kim could be incapacitated following a recent heart operation. Kim was not present at his grandfather’s birthday celebration on April 15, raising speculation about his health.

Trump said U.S. intelligence has not yet confirmed the rumors about Kim’s medical condition.

Kim, 36, could be at risk for health complications, as he is overweight and a smoker. He is also reportedly a heavy drinker with an affinity for hard alcohol.

Kim has led North Korea since 2011, after his father, Kim Jong Il, died of a heart attack. He has continued his family’s antagonism towards the West, frequently shooting off projectiles and expanding the country’s illicit nuclear program.

Kim, however, has had an unusual relationship with Trump, with the two leaders meeting several times in the last two years. The U.S. and North Korea have held diplomatic talks, with Pyongyang wanting sanctions to be reduced on its economy in exchange for a possible path to denuclearization. Negotiations have been at a standstill since October, with North Korea claiming it was “deceived” by the U.S.

The next in line for North Korea's leadership is Kim's sister, Kim Yo Jong. She currently heads the country's propaganda affairs and has frequently accompanied Kim Jong Un on international trips.

Fox News cited sources that the U.S. has contingency plans in the event of Kim Jong Un's death. There are concerns that North Korea could face a humanitarian crisis if Kim dies, with refugees rushing into China.

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