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 WydenOvernight Finance: Stocks bleed as Trump seeks new tariffs on China | House passes .3T omnibus | Senate delay could risk shutdown | All eyes on Rand Paul | Omnibus winners and losers Trump will delay steel tariffs for EU, others Overnight Cybersecurity: Zuckerberg breaks silence on Cambridge Analytica | Senators grill DHS chief on election security | Omnibus to include election cyber funds | Bill would create 'bug bounty' for State MORE (D-Ore.), Patrick LeahyPatrick Joseph LeahyMcCabe oversaw criminal probe into Sessions over testimony on Russian contacts: report Graham calls for Senate Judiciary hearing on McCabe firing McCabe firing roils Washington MORE (D-Vt.), Dianne FeinsteinDianne Emiel FeinsteinFeinstein, Harris call for probe of ICE after employee resigns Jeh Johnson: Media focused on 'Access Hollywood' tape instead of Russian meddling ahead of election What’s genius for Obama is scandal when it comes to Trump MORE (D-Calif.), and Al FrankenAlan (Al) Stuart FrankenMcCabe oversaw criminal probe into Sessions over testimony on Russian contacts: report Academy president accused of sexual harassment: report Top Nike executive resigns amid workplace complaints: report 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 McCainAfghanistan is our longest war ever and Congress has abandoned all responsibility Kremlin: ‘We have a long way to go’ before any breakthrough with US The GOP is Trump's party now MORE (Ariz.), who said he would filibuster a defense bill that contains the provision. Sen. Carl LevinCarl Milton LevinSen. Gillibrand, eyeing 2020 bid, rankles some Democrats The Hill's 12:30 Report Congress needs bipartisanship to fully investigate Russian influence 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.