WASHINGTON — As President Trump amplifies unsubstantiated claims of Ukrainian interference in the 2016 election, the Republican-led Senate Intelligence Committee reaffirmed on Tuesday that Russian operatives engaged in a widespread social media campaign to improve his chances in the race.

In a report, the committee backed up the conclusions of the intelligence community, the special counsel and researchers that Russia mounted a broad campaign to interfere in the election. A Russian troll farm central to the election campaign supported “Donald Trump at the direction of the Kremlin,” the committee said.

The panel said Congress should consider new disclosure requirements for political ads online, which unlike television or radio ads do not need to carry information about who paid for them. A bill introduced in 2017 by the top Democrat on the committee, Senator Mark Warner of Virginia, to put into effect new rules for online ads has failed to gain much momentum.

The report is nonetheless the latest call for lawmakers to reconsider the lax system of regulations that governs Silicon Valley, as Americans have learned more about the way platforms like Facebook, Twitter and YouTube can be used to make money off users’ personal information and to spread disinformation.