Maryland Gov. Martin O’Malley is expected to enter the 2016 presidential race on Saturday. (AP Photo/J. Scott Applewhite)

Former Maryland governor Martin O’Malley’s expected presidential announcement Saturday comes ahead of a crowded week of campaign launches, with at least three more potential candidates gearing up to (almost certainly) jump into the race by this time next week.

— GOP Sen. Lindsey Graham (S.C.) will announce if he is running for the GOP nomination on Monday, June 1 during an event in South Carolina.

Earlier this month Graham inadvertently indicated he's jumping into the race during an appearance on CBS, though he hasn’t formally announced: "I'm running because of what you see on television. I'm running because I think the world is falling apart. I've been more right than wrong on foreign policy," Graham said.

— Former Rhode Island governor Lincoln Chafee (D) will make a “big announcement” during a Wednesday, June 3 speech on foreign policy at George Mason University in Arlington, according to event organizers. Chafee has strongly indicated he will run.

— Former Texas governor Rick Perry (R) has sent out invitations for a “special announcement” event in Dallas on Thursday, June 4. He is widely expected to launch a second presidential bid at the event.

As it stands, there are currently eight major Republican presidential candidates and two Democratic candidates who have formally declared their candidacies. O'Malley's entry Saturday will bring the number of Democratic candidates up to three.

Meanwhile, Wisconsin Gov. Scott Walker (R) and Louisiana Gov. Bobby Jindal (R) have indicated they will make their presidential plans known in mid-June, following the end of their states' legislative sessions.

Most recently, former Pennsylvania senator Rick Santorum (R) and former New York governor George Pataki (R) threw their hats into the ring.

Read more:

[Rick Santorum announces second presidential bid.]

[George Pataki launches presidential campaign.]