WASHINGTON — The man charged with planting two pipe bombs near the Democratic and Republican party headquarters on the eve of the Jan. 6 attack on the U.S. Capitol told the FBI he believed conspiracy theories about the 2020 election, according to two people familiar with the matter.

Brian Cole Jr., 30, is cooperating with the FBI, NBC News has reported, citing a separate person familiar with the matter. Cole is expected to make his first court appearance on Friday. He was charged Thursday with leaving pipe bombs outside the Republican National Committee and Democratic National Committee in the hours before Donald Trump supporters stormed the U.S. Capitol.

Trump has falsely claimed the 2020 election was “rigged.”

Cole was charged with transporting an explosive device and attempted malicious destruction by means of explosive materials, according to charging documents. The FBI has not publicly cited a motive.

The pipe bombs he’s accused of planting were found the day of the Jan. 6 riot, though investigators have said they were place near the RNC and DNC on Jan. 5.

Trump received about 74 million votes nationally in 2020, while Joe Biden received roughly 81 million.

Trump’s claims about the 2020 election were part of former Special Counsel Jack Smith’s investigation into his efforts to overturn the results. In his final report on the investigation, Smith said that Trump “inspired his supporters to commit acts of physical violence” by spreading “demonstrably and, in many cases, obviously false” claims about the 2020 election. Trump has publicly maintained that he believed he won the election.

The criminal case against Trump in connection with the Jan. 6 attack was dropped after he was elected in 2024, but Smith said that “but for Mr. Trump’s election and imminent return to the Presidency, the Office assessed that the admissible evidence was sufficient to obtain and sustain a conviction at trial.”

Smith recently said he wanted to publicly testify about his investigation, but House Republicans rejected his request, instead planning to interview him behind closed doors on Dec. 17.