Senate Minority Leader Charles Schumer Chuck SchumerDemocrats scramble on COVID-19 relief amid division, Trump surprise Pelosi, Schumer 'encouraged' by Trump call for bigger coronavirus relief package Schumer, Sanders call for Senate panel to address election security MORE (D-N.Y.) reminded Democratic colleagues at a lunch meeting Tuesday not to take the bait if President Trump Donald John TrumpBarr criticizes DOJ in speech declaring all agency power 'is invested in the attorney general' Military leaders asked about using heat ray on protesters outside White House: report Powell warns failure to reach COVID-19 deal could 'scar and damage' economy MORE tries to provoke them at the State of the Union address, scheduled to start at 9 p.m. Tuesday.

Tensions are running high after two weeks of the Senate impeachment trial and Democrats think there’s a good chance the president will toss a few political grenades in his speech, even though Republican lawmakers have urged Trump to focus on policy accomplishments.

“Schumer talked about the etiquette of not going crazy. He and [Speaker] Nancy [Pelosi] (D-Calif.) were talking and he said, if you don’t want to go, don’t go,” said a Democratic senator, who said the advice from Schumer was that it would be better to skip the speech than to be caught on camera doing something embarrassing.

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There’s some concern among Democrats that Trump may try to provoke their members with a choice phrase or two at Tuesday’s speech.

“Decorum to me is critically important to me,” said a second Democratic senator, who added the subject of decorum was discussed at the lunch. “I’ve heard some senators mention it."

Republican Rep. Joe Wilson Addison (Joe) Graves WilsonDemocrats raise alarm about new US human rights priorities Democrat Teresa Leger Fernandez defeats Valerie Plame in New Mexico primary Trump campaign launches new fundraising program with House Republicans MORE (R-S.C.) caused an uproar at President Obama’s first address to a joint session of Congress in 2009 when he yelled “You lie!” as the president talked about health care reform.

Presidents usually recite long lists of policy proposals and accomplishments at their State of the Union addresses leaving reporters and other media analysts to focus closely on the reactions of lawmakers to liven up their coverage.

Big applause lines are noted as well as what lawmakers decide to sit in their seats and not clap along with their colleagues.

Sometimes observers even try to read the lips of senators on the floor, as happened to Sen. Jacky Rosen Jacklyn (Jacky) Sheryl RosenHillicon Valley: Election officials prepare for new Russian interference battle | 'Markeyverse' of online fans helps take down a Kennedy | GOP senators unveil bill to update tech liability protections Google, Apple, eBay to meet virtually with lawmakers for tech group's annual fly-in Senate Democrats demand answers on migrant child trafficking during pandemic MORE (D-Nev.) at last year’s State of the Union when some amateur sleuths thought they detected her saying “Watch your ass” after Sen. Kyrsten Sinema (D-Ariz.) applauded one of Trump’s lines.

Rosen later denied she had said that but the episode is a reminder to Democrats who are fuming over Trump’s imminent acquittal on two articles of impeachment that their reactions Tuesday will be closely scrutinized.