Mike Johnson says he believes the War Powers Act, the Nixon-era resolution designed to curb presidents' power to wage war without congressional approval, is unconstitutional.

There is no available direct evidence or verifiable source confirming that Mike Johnson has publicly stated that he believes the War Powers Act is unconstitutional. Without a reliable statement, interview, or official record, this claim cannot be confirmed or denied.

Sources: Based on general knowledge and the absence of direct evidence in the provided search results.