IRS commissioner Charles Rettig is the man standing between Congress and Trump's tax returns

A showdown between the White House and House Democrats over the release of President Donald Trump's personal tax returns comes down to one man: Charles Rettig, head of the Internal Revenue Service.
Rettig, 62, a veteran California tax attorney, spent more than 35 years representing taxpayers in disputes with federal and state tax agencies until he was sworn in as IRS commissioner last October.
That makes him the only person in Washington with the authority to turn over the President's personal tax returns under an obscure tax law...