Republican presidential candidate Donald Trump speaks during a news conference at the Trump National Golf Club on Tuesday in Jupiter, Fla.

Supporters react to positive primary results for Democratic presidential candidate Hillary Clinton before a rally at Cuyahoga Community College on Tuesday in Cleveland.

Democratic presidential candidate, Sen. Bernie Sanders, I-Vt. acknowledges his supporters on arrival at a campaign rally Tuesday in Miami.

Republican presidential candidate Sen. Ted Cruz, R-Texas, greets supporters during a campaign rally at Central Baptist Church in Kannapolis, N.C., on Tuesday.

Republican presidential candidate Sen. Marco Rubio, R-Fla., holds a baby for a photograph during a campaign rally in Sarasota, Fla., on Tuesday.

Karen Kasich, wife of Republican presidential candidate, Ohio Gov. John Kasich, speaks at the Lansing Brewing Company on Tuesday in Lansing, Mich.

Supporters of Republican presidential candidate Donald Trump put their fingers in the shape of a "T" upon hearing the news that Trump won the Mississippi primary election, before a news conference at the Trump National Golf Club on Tuesday in Jupiter, Fla.

Democratic presidential candidate Hillary Clinton speaks during a rally at the Charles H. Wright Museum of African American History, Monday in Detroit, Mich.

Harry Williams, left, and Joe Baricev organize supplies near a polling place Tuesday in D'Iberville, Miss., where they were collecting signatures for an initiative to add a constitutional amendment to keep the current state flag. Another group is collecting signatures to have the flag changed.

Troy Drake votes with two of his children during the primary election at Boise Bible College in Garden City, Idaho, on Tuesday. Idaho Republicans headed to the polls to take part in the state's presidential primary.

A man stands in the doorway to cool down at Precinct 15 in Flint, Michigan, during the primary election on Tuesday. Presidential candidates in both parties were looking to Michigan for one of the largest delegate hauls in the bruising nominating contests.

Volunteers for the Marco Rubio campaign talk with potential voters in Honolulu. Hawaii's world-class beaches and swaying palm trees may lure tourists, but as Republicans prepare for Hawaii's GOP presidential caucus Tuesday, the far-away state isn't drawing the candidates' love.

Voters fill out their ballots during the primary election Tuesday at the Fort Gratiot Township Hall in Fort Gratiot, Michigan.

Ron Shapiro votes during the primary election at the Oxford Conference Center in Oxford, Mississippi on Tuesday. Mississippi holds its presidential and congressional primaries today.

Jonathan McPhail stands with his children Emma and Benjamin as he casts his ballot in the presidential and congressional primary at Precinct 516 in Pearl, Miss., on Tuesday.

Republican presidential candidate Sen. Ted Cruz, R-Texas, waves to the crowd during a campaign rally Tuesday at Calvary Baptist Church in Raleigh, N.C.

Lennette Williams, of Grosse Pointe Farms, Mich., listens as Democratic presidential candidate Hillary Clinton speaks during a rally at the Charles H. Wright Museum of African American History on Monday in Detroit, Mich., a day before the Democratic primary in that state.