Live Election Day updates: Polls open in key states that could determine House and Senate control

Biden’s approval rating stands at 44% going into Election Day, according to a poll released Sunday by NBC News.

It puts him in similar standing as former Presidents Donald Trump (46%) and Barack Obama (45%) in the final NBC News/WSJ poll taken before the midterm elections.

The poll, which has a margin of error of 3.5 percentage points among likely voters, found 48% preferred Democrats to control Congress and 47% preferred Republicans. It’s a reverse from October when 48% of likely voters preferred Republicans and 47% preferred Democrats in the NBC News poll. Both are within the margin of error.

— Emma Kinery

Voters in the middle of the country started heading to the polls at 7 a.m. ET in Missouri and lined up for voting starting at 8 a.m. ET in Arizona, both 6 a.m. local times.

The races between Democratic senatorial candidate Trudy Busch Valentine and Republican rival Eric Schmitt in Missouri and incumbent Democratic Sen. Mark Kelly and Republican senatorial candidate Blake Masters in Arizona are big ones to watch in these states.

Polls also open at 8 a.m. ET in Wisconsin (7 a.m. local time) where Republican incumbent Sen. Ron Johnson is running against Democratic candidate and Lt. Gov. Mandela Barnes.

Voters choose between Republican incumbent Mike Lee or Independent Evan McMullin for U.S. Senate in Utah, starting at 9 a.m. ET (7 a.m. local time).

— Chelsey Cox

Former President Donald Trump said Monday night he will make a “big announcement” on Nov. 15 at his Mar-a-Lago resort, where he is widely expected to launch his 2024 presidential campaign.

“I’m going to be making a very big announcement on Tuesday, Nov. 15 at Mar-a-Lago in Palm Beach, Florida,” Trump said at a Save America rally in Vandalia, Ohio on the eve of the midterm elections.

Trump is eager to jumpstart his third run for president, and staffing conversations have ramped up significantly in recent weeks. An early list of potential top aides has already trickled out.

Trump’s line about Nov. 15 came near the end of a more than 90 minute speech for GOP candidate J.D. Vance in Ohio. Instead of focusing on Vance, the former president railed against Democrats, judges who have ruled unfavorably in cases against his family, run down U.S. airports and above all, President Joe Biden.

A Trump spokesman did not respond to a request from CNBC to confirm that his Nov. 15 event will be a campaign launch.

As Trump inches closer to formally kicking off the 2024 presidential race, polls show he enjoys unparalleled support among Republican voters.

Trump would also enter the race with more than $60 million in cash held by his leadership PAC, Save America, and a prodigious small dollar fundraising operation that vacuums up online donations from the Republican base.

— Christina Wilkie

Voters can head to the polls as soon as 6 a.m. ET in Virginia and as early as 6 a.m. ET in New Hampshire, with North Carolina and Ohio following close behind at 6:30 a.m. ET.

Polling places open at 7 a.m. ET for voters in Florida, Georgia, Pennsylvania and Michigan.

Big races to watch in these states are the showdown between incumbent Republican Sen. Marco Rubio and Democratic Rep. Val Demings in Florida for U.S. Senate. Democratic incumbent Sen. Raphael Warnock is also running against controversial Republican first-timer Herschel Walker in Georgia, and incumbent Democratic Gov. Gretchen Whitmer takes on Republican Tudor Dixon for governor of Michigan.

— Chelsey Cox