“Our target date is June 7th, but our goal is in the middle of May to be the presumptive nominee,” says Paul Manafort, Donald Trump’s convention campaign manager.

Republican presidential frontrunner Donald Trump and his campaign team say they have adjusted their strategy to win over hotly-contested delegates to the national convention, and believe he will be the presumptive nominee by mid-May.

As the presidential race heats up, the need to assemble 1,237 delegates to achieve the Republican nomination before the national convention has campaigns revisiting their efforts.

Many of the delegates that are selected at county and state conventions are up for grabs after the votes are tallied at the ballot box.

Despite winning a majority or plurality of votes in some states, Donald Trump has found himself facing difficulty in the delegate fight as the campaign of Senator Ted Cruz has begun to see success.

Senator Cruz and his campaign have spent months building an effort to identify delegates at state conventions who will potentially support his candidacy.

According to the Washington Post, the Trump campaign needs to hit another hot streak in the next month or so in order to lock down the nomination before a potential contested convention:

To do so, Trump would have to go on a month-long hot streak, starting in New York on April 19th, that would deliver a sizable haul of delegates — including increased commitments from those who are unbound — and quiet widespread talk that his unpopularity and his campaign’s sloppy execution have made it nearly impossible to avoid a contested convention.

The earliest Trump could assemble the 1,237 delegates needed for the nomination is on the final day of the primary season, June 7th, when the big states of California and New Jersey vote. Between now and then, he needs to win nearly 60 percent of the delegates still available — a higher percentage than he has thus far.

Paul Manafort, Trump’s convention campaign manager, expressed confidence in the campaign’s newly revised approach saying, “Our target date is June 7th, but our goal is in the middle of May to be the presumptive nominee.”

If a contested convention to determine the Republican nominee occurs — which seems likely — the result would be a two week fight “over rules, credentials, platform planks and eventually the nomination itself.”

Many Republican advisors are worried that a contested convention would lead to chaos on the floor, and a potential inability to manage an unpredictable process.

The Ted Cruz campaign sees a light at the end of the tunnel in that scenario, where campaigns invest heavily in grassroots mobilization efforts and convention strategy.

Meanwhile, the RNC has spoken with the Trump, Cruz, and Kasich campaigns to arrange a joint fundraising that allows the three remaining candidates to legally raise more money for the national party.