Thompson's Role as Designated Survivor in State of the Union Address
Designated-survivor practice began during the Cold War and post-9/11 changes.
House Minority Leader Hakeem Jeffries said the practice protects the legislature.
Thompson criticized President Trump for harming families and democracy.
Thompson vows to hold Trump accountable in Congress, courts, and public opinion.
Napa city council member Bernie Narvaez will attend the joint session.
White House hasn't disclosed its designated survivor.
Observers questioned Thompson's selection, with some calling him ineligible.
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