"Recently, public reports have raised questions about any role you may have played in conveying or reinforcing the President's stark message to the Ukrainian President", the letter read.
The subpoena demands a series of documents related to Perry's knowledge of President Donald Trump's July 25 phone call with Ukrainian President Volodymyr Zelensky.More news: Gowdy joins Trump's personal legal team
Cipollone then accused the Democrat-led House of entering unprecedented territory in launching an impeachment inquiry without a House vote. The original arrangement was that the delegation would be headed by Vice President Mike Pence, who reportedly was ordered by Trump not to attend the ceremony. He has denied any wrongdoing.
Trump said Thursday he did not know why Democrats are focusing on Perry.
They gave Perry till October 28 at hand over the paperwork, and warned that failure to take action, "including at the direction or behest of the President or the White House, shall constitute evidence of obstruction of the House's impeachment inquiry".More news: Samsung Could Be Launching Galaxy S11 Lite
The core of the Democrats' inquiry appears to rest on that July 25 call in which Trump pressured Zelenskiy to investigate former Vice President Joe Biden, a potential 2020 opponent, in exchange for US military aid. Those affiliates, Igor Fruman as well as Lev Parnas, were apprehended Thursday on campaign finance and conspiracy theory charges.
The two were charged with allegedly violating campaign finance law by funneling foreign money to USA politicians.
The Associated Press reported this week that a circle of businessmen and Republican donors touted their connections to Trump and his personal lawyer, Giuliani, as they sought to install new management at the top of Ukraine's state-owned gas company last spring.More news: Daniil Medvedev sees off Stefanos Tsitsipas to reach Shanghai Masters final
The Biden investigation, which Trump has said he requested because of corruption rather than political concerns, is part of the reason that brought the president into the impeachment inquiry, and Giuliani under a congressional subpoena.