WASHINGTON, Sept 13 (Reuters) - Two U.S. lawmakers sponsoring a bill to impose tough sanctions on Russia over its war on Ukraine said on Saturday they will urge fellow lawmakers this week to tie their bill to must-pass legislation on keeping the federal government operating.

Senator Lindsey Graham and U.S. Representative Brian Fitzpatrick, both Republicans, have sponsored legislation for months to impose the measures on Moscow it if refuses to negotiate a peace deal with Ukraine. The measures include secondary sanctions on India and China for buying Russian oil.