WASHINGTON (AP) — Democratic and Republican senators exasperated with the Obama administration’s response to Russia’s aggression in Ukraine threatened on Wednesday that Congress will act unilaterally on new sanctions.

“What are we waiting for?” Sen. Bob Menendez, D-N.J., chairman of the Senate Foreign Relations Committee, asked twice at a hearing with senior administration officials from State, Treasury and the Defense departments about targeted sanctions that the administration said it was preparing last month.