WASHINGTON—The White House says the president's chief counterterrorism adviser has met with Libya's president and discussed ways that Libya can better help the United States track down those responsible for the deaths of four Americans in Benghazi last month, including U.S. Ambassador Chris Stevens.

John Brennan, assistant to the president for homeland security and counterterrorism, met with Libyan President Mohamed Magariaf and other officials in Tripoli on Wednesday.

The White House says Brennan reinforced U.S. support for Libya as it continues a transition to democracy. Brennan encouraged Libyan officials to take advantage of offers of assistance from the U.S. and other countries to combat terrorism.

The meeting comes as a Republican-led House committee holds a hearing on diplomatic security in the attack that killed Stevens and three other Americans.