Illustration by Elena Scotti/Fusion

Marco Rubio is making it official on Monday.

Rubio, the first-term U.S. senator from Florida, became the fourth major candidate to enter the presidential race. After reportedly letting donors know during a conference call early Monday, he'll make an official announcement during a campaign-style event at Miami's historic Freedom Tower later Monday evening.

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Much of Rubio's candidacy will be built on a generational contrast combined with his perceived electability. Rubio, 43, will likely be the youngest candidate in a rapidly growing field of contenders.

Get smart fast about Rubio. Here's where he stands on the issues important to 2016:

(Graphic by Kent Hernández/Fusion)

Brett LoGiurato is the senior national political correspondent at Fusion, where he covers all things 2016. He'll give you everything you need to know about politics, with a healthy side of puns.