A) Their absence was intentional.
B) They can't anyway, because they've already passed a law last month saying that the entire rest of the legislative year is just one calendar day long:
House Republican leaders on Tuesday quietly moved to shield their members from having to vote on whether to end President Trump’s tariffs on Mexico, Canada and China, tucking language into a procedural measure that effectively removed their chamber’s ability to undo the levies. NYTimes source.
C) Fuck the entire Republican party.
D) Fuck the Democrats for not standing up to this shit.