The subpoena comes one week after the release of a Senate Judiciary Committee report that documented extraordinary tensions within the senior ranks of the Justice Department in December and January as Trump and allies prodded the law-enforcement agency to aid in efforts to undo the election won by Democrat Joe Biden.
Trump’s attorney general, William Barr, had said the Justice Department found no evidence of fraud that could have overturned the presidential election’s outcome.
Unsubstantiated claims of fraud have been repeatedly rejected by judge after judge, including by Trump appointees, and by election officials across the country.
From the archives (January 2021): Trump pressed Justice Department to take election-fraud claims straight to Supreme Court
Source : https://www.marketwatch.com/story/house-select-committee-on-jan-6-subpoenas-former-justice-department-lawyer-jeffrey-clark-01634160444247