Rick Santorum, the former Pennsylvania senator who provided Mitt Romney’s stiffest test during the GOP primary season, will deliver a primetime address to the Republican National Convention later this month.

Republican National Committee Chairman Reince Priebus on Tuesday announced speaking roles for Santorum, former Florida Governor Jeb Bush, Kentucky Senator Rand Paul and Oklahoma Governor Mary Fallin.

“As our party unites around Governor Romney, these four great leaders will lend their voices in support of his vision to get America back on track,” Priebus said in a statement.

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Santorum suspended his campaign in April, two weeks before a primary in his home state that he appeared in danger of losing to Romney. He won 11 states and 255 delegates while running to the right of Romney, particularly on social issues.

After bowing out of the race, Santorum was slow to back Romney, finally endorsing his former rival in a late-night e-mail to his supporters. Santorum has kept a low profile since his exit.

But a primetime speaking slot will once more shine the spotlight on Santorum, who has hinted at a future presidential run by frequently comparing his unsuccessful nominating bid this year to Ronald Reagan’s in 1976. After losing the GOP nomination to Gerald Ford in 1976, Reagan won the nomination and the White House in 1980.

Jeb Bush, son of former President George H.W. Bush and brother of former President George W. Bush, is also considered a possible presidential candidate in future election years.

Rand Paul is the son of Texas Representative Ron Paul, a Republican presidential candidate this year.

Fallin is a first-term governor who also served a term in the House of Representatives.