WASHINGTON — Major cybersecurity, immigration and disaster-relief measures are stalled in the Senate as Homeland Security and Governmental Affairs Committee Chair Rand Paul presses his own priorities, leaving lawmakers with little time to advance legislation before Congress adjourns, according to senators, lobbyists and industry experts interviewed about the committee’s work. Paul, a Kentucky Republican and longtime libertarian, has held up renewal of a 2015 law that lets businesses share cyber threat information with the federal government. He has also slowed renewal of a separate program that provides federal cybersecurity funding to state and local governments. Paul has sought to attach a restriction on the Cybersecurity and Infrastructure Security Agency’s anti-disinformation work to the 2015 law, tying that debate to a different policy issue. The delays come as cyber threats draw renewed attention, including concerns about artificial intelligence tools that could aid hacking. CISA says the information-sharing law remains important to coordination between government and the private sector and warned that allowing it to expire would weaken those protections. Michigan Sen. Gary Peters, the committee’s top Democrat, described efforts to advance bipartisan policy as “a challenge.” Peters has also criticized the panel for not holding its annual national threats hearing or a Department of Homeland Security budget hearing during this Congress. He says the committee has devoted substantial time to investigating the COVID-19 response, including a hearing with former federal health official Anthony Fauci, rather than focusing on forward-looking security work. Paul’s committee has also slowed bipartisan disaster-relief and border-security legislation, while his questions about immigration enforcement contributed to a dispute with the White House. The administration withdrew its nomination of Oklahoma state trooper Lance Schroyer to lead Immigration and Customs Enforcement after Paul sought information about the agency’s investigations into a surge of enforcement in Minneapolis, where officers fatally shot two U.S. citizens in January. Paul’s spokesperson, Drew Carmichael, defended the senator’s record, saying the committee has stopped acting as a “cheerleader for more government” and is asking questions and holding officials accountable. Carmichael also cited Paul’s work on border-security funding during President Donald Trump’s first administration and said the committee had advanced nearly 40 nominees, including two secretaries of Homeland Security. Republican senators offered a mixed, guarded assessment. Wisconsin Sen. Ron Johnson praised Paul’s COVID-19 investigations but, when asked about immigration and cybersecurity, pointed to Trump’s record on border security. Oklahoma Sen. James Lankford said committee members work through differences over the chair’s priorities. Florida Sen. Rick Scott said Paul works hard for the public. The committee’s disputes extend to the Department of Homeland Security. Paul and DHS Secretary Markwayne Mullin have a strained relationship, dating in part to remarks Mullin made about an assault that seriously injured Paul. DHS said Mullin had promised to remain accessible to Congress and that the department continues to communicate with lawmakers. The House’s top Republican on homeland security, New York Rep. Andrew Garbarino, has also complained that Senate rules and a single senator can hold up cyber legislation. A lobbyist who spoke anonymously said Paul often voices objections in hearings or public comments without translating them into legislation, making it difficult to reach bipartisan agreements. With only a few working weeks remaining in the current Congress, the stalled measures may not move until a new Congress convenes in January. That leaves state and local governments, businesses and federal agencies facing continued uncertainty over cyber protections and other homeland security priorities.