U.S. congressional Democrats said on Tuesday they are not satisfied with the Trump administration's decision to ease sanctions on companies linked to Russian oligarch Oleg Deripaska, demanding briefings and planning legislation.

The leaders of four House of Representatives committees said they were considering legislation to ensure Russian aluminum giant Rusal and its parent En+ comply with the agreement that allowed them to be removed from a U.S. sanctions list.

"We are considering additional legislative actions to ensure that (the U.S.) Treasury and these companies comply with the agreement in letter and in spirit," the four Democratic chairs of the House Ways and Means, Foreign Affairs, Intelligence and Financial Services committees said in a joint statement.