Democrats in Congress said what they were watching was a familiar refrain - where President Trump takes a stand on an issue which ordinarily would draw a furious response from the GOP - but little to nothing is ever done by Republican members to do anything about it.
"The Senate could stop these insane tariffs on Mexico tomorrow morning," said Sen. Brian Schatz (D-HI), as he called for a vote on a measure to block the President's tariff threat.
"Democrats and Republicans agree: threatening a neighbor and ally with senseless, shortsighted tariffs over an unrelated issue is simply reckless." said Sen. Tom Carper (D-DE).
Complicating matters was the unresolved issue of whether President Trump will have to declare another national emergency, in order to invoke powers under a 1977 law, then using that to slap tariffs on imports from Mexico.
"The old one doesn't include the current possible action," said Sen. Tim Scott (R-SC), said of the President's emergency border declaration. "So, it appears they have to do something new."
"The way they put it was is they are still working through all of the details on it," said Sen. Mike Rounds (R-ND).
If a new emergency is needed, that could prompt a new round of votes in both the House on a resolution to disapprove of the President's emergency declaration.
Such a disapproval resolution passed both the House and Senate on Mr. Trump's move to shift money around in the military budget in order to fund construction of a border wall - the President vetoed that measure, and Congress was unable to override that veto.