WASHINGTON — Lawyers for Donald Trump on Monday blasted the impeachment case against him as an act of “political theater” as they accused House Democrats of exploiting the chaos and trauma of last month’s riot at the U.S. Capitol for their party’s gain.In a brief filed on the eve of the impeachment trial, lawyers for the former president leveled a wide-ranging attack on the case, foreshadowing the claims they intend to present when arguments begin Tuesday on the same Senate floor that was invaded by rioters on Jan. 6.They …