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Yemeni Vice-President Abd-Rabbu Mansour Hadi has replaced President Ali Abdullah Saleh in his absence, and is in command of the armed forces and security services.
He met US ambassador Gerald Michael Feierstein, state news agency Saba reported, to discuss "the importance of co-operation with the [opposition] Common Forum" alliance.
Yemen's conflict began in January with peaceful anti-government protests inspired by uprisings in Tunisia and Egypt.
In recent weeks it has developed into street battles in Sanaa between government forces and fighters loyal to Sheikh Sadeq al-Ahmar, head of the powerful Hashid tribal federation. The fighting has left more than 160 dead and brought the country to the brink of civil war.
Renewed fighting was reported in Sanaa on Sunday.
Four Yemeni soldiers also died in an attack in the southern city of Taiz, officials said. One attacker was also killed.
In the southern port city of Aden, militants attacked an army checkpoint wounding two soldiers, witnesses said.
Source: Goal