WASHINGTON — In the wake of the Senate acquitting President Trump in an impeachment trial over his efforts to pressure Ukraine to investigate his political rivals including former Vice President Joseph R. Biden Jr., Republican senators are pressing ahead with their probes into the finances of Mr. Biden’s son, Hunter Biden.

Last year, the top Republicans on two Senate committees — the Finance Committee and Committee on Homeland Security and Governmental Affairs — requested documents from the Treasury Department related to Hunter Biden’s business relationship with Burisma Holdings, a Ukrainian energy company, as part of an investigation into whether the Obama administration acted improperly to benefit Burisma. The request sought “Suspicious Activity Reports” and other documents involving Mr. Biden and 10 other individuals and companies.

A spokeswoman for Senator Ron Wyden of Oregon, the top Democrat on the Finance Committee, said that Treasury has complied with the request after stonewalling many requests for information from Democrats pursuing investigations into the White House. Yahoo News first reported that Treasury complied.

“Applying a blatant double standard, Trump administration agencies like the Treasury Department are rapidly complying with Senate Republican requests — no subpoenas necessary — and producing ‘evidence’ of questionable origin,” Ashley Schapitl, the spokeswoman, said in a written statement. “The administration told House Democrats to go pound sand when their oversight authority was mandatory while voluntarily cooperating with the Senate Republicans’ sideshow at lightning speed.”