The U.S. House of Representatives voted overwhelmingly on July 25 to cement new sanctions on Russia, despite objections from President Donald Trump.
House members backed the measure by 419 to 3, with strong support from Trump's fellow Republicans as well as Democrats.
The Senate, which had earlier passed a similar measure, was expected to act soon after the House vote. If passed by both chambers, the legislation could be sent to the White House within a week.
Both chambers are expected to have enough votes to override a possible presidential veto of the legislation, which also imposes tough new sanctions on Iran and North Korea.
House Speaker Paul Ryan said after the vote that the sanctions package "tightens the screws on our most dangerous adversaries in order to keep Americans safe."
But Trump, who has repeatedly said he wants to improve ties with Moscow, has suggested he may target the bill with what would be his first veto since taking office.
The sanctions bill has drawn criticism from Russia as well as from some of Washington's European Union allies, who have warned it would interfere with key energy projects in Europe.
With reporting by Reuters, AFP, and AP