WASHINGTON (AP) — Former President Donald Trump is suing the House committee investigating the Jan. 6 attack on the U.S. Capitol in an attempt to block a subpoena requiring him to testify.

The suit contends that, while former presidents have voluntarily agreed to provide testimony or documents in response to congressional subpoenas in the past, "no president or former president has ever been compelled to do so."

"Long-held precedent and practice maintain that separation of powers prohibits Congress from compelling a President to testify before it," Trump attorney David A. Warrington said in a...