Vice President Biden and Rep. Paul Ryan clashed over Libya, Afghanistan and the economy in the campaign’s only vice-presidential debate Thursday, interrupting and re-interrupting one another during a 90-minute exchange shaped by Biden’s aggressive tone.

Ryan picked up themes used by his running mate, Mitt Romney, in last week’s presidential debate. He criticized the Obama Administration for its handling of an attack in Libya, and accused it of dodging hard questions about the debt.