Gov. Rick Scott will enter the race for U.S. Senate on Monday morning, signaling the official start of a contest with incumbent Democratic Sen. Bill Nelson that will be one of the most watched in the country — and one of the most expensive.

The Republican will make the announcement at 10 a.m., according to social media postings, and it will be carried live on Facebook. The event will take place at at ODC Construction in Orlando followed by a second at Sun Harvest Citrus in Fort Myers.

Scott will continue the roll out with an event Tuesday in Hialeah, and other cities are expected.

Please join me on Facebook Live, tomorrow at 10AM to hear my big announcement. https://t.co/xUNFWdyGxN pic.twitter.com/ov8mItqZXZ — Rick Scott (@ScottforFlorida) April 8, 2018

Scott, 65, has served two terms as governor after emerging from obscurity in 2010, aided by his personal fortune as a health care CEO. Though not a charismatic figure, Scott has shown himself to be a disciplined messenger, almost exclusively on jobs. He's expected to again portray himself as an outsider and he's taken shots at dysfunctional Washington.

At the same time, Scott's association with President Donald Trump will be a litmus test of the president's popularity in a swing state he won by a narrow margin over Hillary Clinton.

Nelson, seeking his fourth term, will make Trump a central figure in the race and he's been stepping up appearances across the state.

Great talking with folks in Wildwood! We discussed a host of issues from the importance of protecting Medicare to legislation I’ve filed to create fuel reserves along hurricane evacuation routes, like here in Sumter County. pic.twitter.com/eDs6wlyCgi — Bill Nelson (@SenBillNelson) April 8, 2018

Democrats have been quick to attack Scott's credentials and Sunday, Senate Majority PAC released a digital ad that touched on Scott's controversial past as a health care executive while accusing him of favoring the rich over average people.

"He won't look out for you there," the ad states.