President Donald Trump’s State of the Union address Tuesday at 9 p.m. Eastern is likely to be a test run of the message Republicans will give to voters in November’s elections for control of the House and the Senate.

The president and his party appear vulnerable, with polls showing much of America distrusts how Trump has managed the government in his first year back in office. In addition, the Supreme Court last week struck down one of the chief levers of his economic and foreign policy by ruling he lacked the power to impose many of his sweeping tariffs.

Though Trump is expected to focus on domestic issues, his intensifying threats about launching military strikes on Iran over its nuclear program cast a shadow over the address.

Virginia Gov. Abigail Spanberger will give the Democratic Party response following Trump’s speech. California Sen. Alex Padilla, who made national headlines last year after being forced to the ground and handcuffed by federal agents, will deliver the party’s response in Spanish.

Watch the livestream here.