Washington-U.S. Democratic presidential candidate Hillary Clinton has slammed Republican presidential candidate Donald Trump, saying “he’s not just unprepared” and is “temperamentally unfit to hold an office that requires knowledge, stability and immense responsibility.”

Clinton made her remarks late Thursday during a speech in San Diego, California.

On foreign affairs, Clinton accused Trump of being unable to become the commander of the U.S. army or deal with its nuclear arsenal.

His foreign policy platform is “dangerously incoherent,” she said.

She lambasted his “bragging” approach to foreign policy based on a string of “nasty tweets” and accused him of harboring a “bizarre” affinity for leaders like Russian President Vladimir Putin and North Korean dictator Kim Jong-Un.

Clinton added: “I will leave it to the psychiatrists to explain his attraction to tyrants” before taking aim at Trump’s claim that being a global business tycoon equips him with significant global knowledge.

Hours later, the presumptive Republican nominee called the speech “a Donald Trump hit job.”

“That was a phony speech,” Trump said at a rally in San Jose, California.

He accused Clinton of misrepresenting his foreign policy views and revived a nickname he once reserved for former rival Ted Cruz.

“She made up my foreign policy,” Trump said. “She’s Lyin’ Hillary.”

“Clinton has to go to jail,” he said for her actions in a classified email scandal during the time she served as Secretary of State.

In a related development, House Speaker Paul Ryan endorsed Trump, a key step toward building unity ahead of the U.S. general election in November.

The top-ranked Republican currently elected to public office, Ryan dropped a bombshell last month, triggering soul-searching within the fractured party when he said he was “just not ready” to support Trump as the flag bearer.

Ryan said he would start introducing a series of policy proposals next week to “address the American people’s top priorities.”

Following talks with the billionaire businessman last month under pressure from other party leaders, the House speaker said Thursday he is sure Trump would implement his proposals and “help us turn the ideas in this agenda into laws to help improve people’s lives.”