President-elect Donald Trump’s onetime national security adviser warns that his former boss returning to the White House will significantly increase the risk of “an international crisis.”John Bolton—who served as Trump’s national security adviser for 17 months from April 2018 to September 2019—dismissed the president-elect’s claims that he is uniquely positioned to resolve international conflicts in Ukraine and Gaza in an interview with The Guardian.

It’s typical Trump: it’s all braggadocio,” Bolton told the outlet. “The world is more dangerous than when he was president before. The only real crisis we had was COVID, which is a long-term crisis and not against a particular foreign power but against a pandemic.

Bolton, who was also a US ambassador to the United Nations, slammed Trump for his lack of knowledge, interest in facts or coherent strategy.