Republican presidential candidate Donald Trump on Saturday mocked President Barack Obama after criticizing Iranian leaders for undermining the “spirit” of last year’s nuclear agreement.

“I hear Obama is very unhappy with Iran because he feels they haven’t lived up to the ‘spirit’ of the agreement. What the hell did he think was going to happen? He is like a baby. He’s like a baby,” Trump said during a campaign rally in Eau Claire, Wisconsin. “They defaulted on day one. How we have this man as a president is so embarrassing. Anybody in their right mind would have known what he is getting into.”

Trump was referring to President Obama’s comments during a press conference at the conclusion of the Nuclear Security Summit in Washington, D.C., on Friday. “Iran so far has followed the letter of the agreement, but the spirit of the agreement involves Iran also sending signals to the world community and businesses that it is not going to be engaging in a range of provocative actions that are going to scare businesses off,” Obama said. “When they launch ballistic missiles with slogans calling for the destruction of Israel, that makes businesses nervous.”

“Iran has to understand what every country in the world understands, which is businesses want to go where they feel safe, where they don’t see massive controversy, where they can be confident that transactions are going to operate normally,” he added.

But Trump stuck to his claim that Iran violated the nuclear deal by launching several ballistic missile tests in past months by not respecting the United States. “The agreement is two seconds old. The ink hasn’t even dried,” the Republican presidential front-runner said. “They were buying missiles from Russia; they were testing missiles. They don’t care about him.”

Later on, Trump said the Iranians abused Sec. of State John Kerry ‘mentally” and “like a child” during the nuclear negotiations. “They took advantage of him like he was a baby,” he said while claiming that he would outsmart and outmaneuver Iran’s Foreign Minister, Mohammad Javad Zarif.