President Trump took to Twitter on Monday to weigh in on a potential 2020 presidential campaign challenger. Former Secretary of State John Kerry is considering running again and Trump let him know what he thinks about that possibility.

According to The Hill:

President Trump on Monday tweeted that he would be “so lucky” if former Secretary of State John Kerry launched a White House bid to challenge Trump in 2020.

“I see that John Kerry, the father of the now terminated Iran deal, is thinking of running for President. I should only be so lucky – although the field that is currently assembling looks really good – FOR ME!” Trump tweeted.

I see that John Kerry, the father of the now terminated Iran deal, is thinking of running for President. I should only be so lucky – although the field that is currently assembling looks really good – FOR ME!

— Donald J. Trump (@realDonaldTrump) September 3, 2018

Kerry, the 2004 Democratic presidential nominee, did not rule out a potential 2020 White House bid during an interview on Sunday. He said on CBS’s “Face the Nation” that talking about the 2020 race is a “distraction.”

“Talking about 2020 right now is a total distraction and waste of time,” Kerry said. “What we need to do is focus on 2018. We need to win back the confidence of the country to move in a better direction and to do it in sensible ways. We are in a moment of crisis for our country. The world is in a moment of crisis.”

Kerry has promised to continue fighting for the failed deals that Trump has pulled the United States out of since taking office.