Vice President Biden’s speech to a defense establishment think tank Monday in Washington was also a rebuttal of Donald Trump’s foreign policy, which Biden says reflects “the attitude and insecurity of a bully.”

Biden says this of American leadership: “[Leadership is ] our ability to lead by example and draw partners to our side. That’s what has always made America great. Not empty bluster. Not a sense of entitlement that fundamentally disrespects our partners. Not the attitude and insecurity of a bully.”

The remarks seem to be part of a more aggressive White House strategy to condemn Trump’s foreign policy talking points. Last week, President Obama attacked Republicans, like Trump, who insist that Obama declare war on “radical Islam.”