Some of the chief supporters of repealing the ban on openly gay people serving in the military are upping their pressure on Congress to scrap the law this year.

Nine senators will be joined by the nation’s most prominent gay rights organizations on Thursday to make the case that Congress should repeal the Clinton-era law, known as “Don’t ask, don’t tell,” as part of the massive 2011 defense authorization bill.

Sens. Joe Lieberman (I-Conn.), Mark UdallMark Emery UdallSenate GOP rejects Trump’s call to go big on gun legislation Democratic primary could upend bid for Colorado seat Picking 2018 candidates pits McConnell vs. GOP groups MORE (D-Colo.), Kirsten Gillibrand (D-N.Y.), Roland Burris (D-Ill.), Barbara BoxerBarbara Levy BoxerThe ‘bang for the buck’ theory fueling Trump’s infrastructure plan Kamala Harris endorses Gavin Newsom for California governor Dems face hard choice for State of the Union response MORE (D-Calif.), Ron WydenRonald (Ron) Lee WydenHillicon Valley: Facebook, Google struggle to block terrorist content | Cambridge Analytica declares bankruptcy in US | Company exposed phone location data | Apple starts paying back taxes to Ireland Firm exposes cell phone location data on US customers Overnight Finance: Watchdog weighs probe into handling of Cohen bank records | Immigration fight threatens farm bill | House panel rebukes Trump on ZTE | Trump raises doubts about trade deal with China MORE (D-Ore.), Patrick LeahyPatrick Joseph LeahyDem senator mocks Pruitt over alleged security threats: 'Nobody even knows who you are' Pruitt tells senators: ‘I share your concerns about some of these decisions’ Protesters hold up 'fire him' signs behind Pruitt during hearing MORE (D-Vt.), Dianne FeinsteinDianne Emiel FeinsteinCongress — when considering women’s health, don’t forget about lung cancer Overnight Energy: Pruitt taps man behind 'lock her up' chant for EPA office | Watchdog to review EPA email policies | Three Republicans join climate caucus Man who coined 'lock her up' chant to lead EPA's Pacific Southwest office MORE (D-Calif.), and Al FrankenAlan (Al) Stuart Franken100 days after House passage, Gillibrand calls on Senate to act on sexual harassment reform Eric Schneiderman and #MeToo pose challenges for both parties Senate confirms Trump judicial pick over objections of home-state senator MORE (D-Minn.) will hold a press conference at the Capitol Visitors Center at 11:30 a.m. on Thursday. They will be joined by representatives from the Human Rights Campaign; the Servicemembers Legal Defense Network; Servicemembers United; the Center for American Progress Action Fund, and the Third Way.

Repeal still faces an uphill battle in Congress because of opposition from key Republicans, including Sen. John McCainJohn Sidney McCainHow House Republicans scrambled the Russia probe The Hill's 12:30 Report The Hill's Morning Report - Sponsored by CVS Health - A pivotal day for House Republicans on immigration MORE (Ariz.), who said he would filibuster a defense bill that contains the provision. Sen. Carl LevinCarl Milton LevinHow House Republicans scrambled the Russia probe Congress dangerously wields its oversight power in Russia probe The Hill's Morning Report — Sponsored by CVS Health — Trump’s love-hate relationship with the Senate MORE (D-Mich.), the chairman of the Senate Armed Services Committee and a key supporter of repeal, said that he would hold hearings immediately after the Pentagon releases a report on the implications of repealing the ban. That report is due Dec. 1.

The report and hearings could breathe some life into the efforts to repeal the ban, but much depends on how long Congress will be in session in December and whether there will be enough time to iron out differences on the bill with the House. Also, Republican opposition to including repeal in the defense bill is also not likely to ease up over the next few weeks.