Supporters of an online sales tax are unlikely to get a vote on their bill during this session of Congress.

Christina Mulka, a spokeswoman for Sen. Dick Durbin (D-Ill.), said the bill is unlikely to come up this year. Durbin plans to re-introduce the measure during the next session of Congress, she said.

“It’s no secret that time is running out,” said David French, the top lobbyist for the National Retail Federation, which supports the legislation.

The supporters of the bill had tried unsuccessfully to add it as an amendment to various other pieces of legislation, including the defense authorization bill and a cybersecurity bill.

An aide to Sen. Max Baucus (D-Mont.), the chairman of the Finance Committee, said the senator believes Congress should deal with the issue as part of comprehensive tax reform legislation next year.