U.S. Defense Secretary Jim Mattis said Sunday that the United States was in consultation with its European allies on an arms control treaty, as NATO members urge Washington to try to bring Russia back into compliance with the pact rather than quit it.

President Donald Trump said on Oct. 20 that Washington planned to quit the Intermediate-Range Nuclear Forces (INF) Treaty that Mikhail Gorbachev, the last Soviet leader, and Ronald Reagan had signed in 1987.

Washington has cited Russia's alleged violation of the treaty as its reason for leaving it, a charge Moscow denies. Russia in turn accuses Washington of breaking the pact and says it is working to answer U.S. questions about the pact.