Boycotting the hearing is probably the right call for them, although there are obvious downsides to that and obvious upsides to attending.
In a statement on Wednesday, Stephanie Grisham, the White House press secretary, did not give any indication about whether Mr. Trump or his lawyers intended to accept the invitation. But people familiar with the president’s legal strategy have said privately that they are deeply suspicious of taking part in a process they view as unfair to Mr. Trump.
“What is obvious to every American is that this letter comes at the end of an illegitimate sham partisan process,” Ms. Grisham said in the statement. “The president has done nothing wrong, and the Democrats know it.”…
The question of how much the president and his legal advisers decide to participate is likely to be a contentious one as his team wrangles with Democrats over Mr. Trump’s rights to present his defense to lawmakers and the public.
Why boycott? For just the reason Grisham gives — because the endless “witch hunt” rhetoric logically requires a show of contempt towards Nadler’s invitation. Even though Trump’s lawyers will be permitted to question Democratic witnesses this time, there are other procedural privileges which the White House has requested that Democrats won’t grant: