GOP frontrunner Donald Trump responded on Twitter late Sunday night to the announcement that Ohio Gov. John Kasich and Sen. Ted Cruz (R-TX) have a coordinated effort to stop Trump in upcoming primaries.

Wow, just announced that Lyin' Ted and Kasich are going to collude in order to keep me from getting the Republican nomination. DESPERATION! — Donald J. Trump (@realDonaldTrump) April 25, 2016

Lyin' Ted and Kasich are mathematically dead and totally desperate. Their donors & special interest groups are not happy with them. Sad! — Donald J. Trump (@realDonaldTrump) April 25, 2016

Late Sunday night, Katich’s campaign announced they are focusing on Oregon and New Mexico, while Cruz’s campaign focuses on Indiana, adding, “We would expect independent third-party groups to do the same and honor the commitments made by the Cruz and Kasich campaigns.”

The full statement from the Kasich campaign is as follows:

Tonight, Kasich for America chief strategist John Weaver issued the following statement: “Donald Trump doesn’t have the support of a majority of Republicans – not even close, but he currently does have almost half the delegates because he’s benefited from the existing primary system. Our goal is to have an open convention in Cleveland, where we are confident a candidate capable of uniting the Party and winning in November will emerge as the nominee. We believe that will be John Kasich, who is the only candidate who can defeat Secretary Clinton and preserve our GOP majority in the Congress. Due to the fact that the Indiana primary is winner-take-all statewide and by congressional district, keeping Trump from winning a plurality in Indiana is critical to keeping him under 1237 bound delegates before Cleveland. We are very comfortable with our delegate position in Indiana already, and given the current dynamics of the primary there, we will shift our campaign’s resources West and give the Cruz campaign a clear path in Indiana. In turn, we will focus our time and resources in New Mexico and Oregon, both areas that are structurally similar to the Northeast politically, where Gov. Kasich is performing well. We would expect independent third-party groups to do the same and honor the commitments made by the Cruz and Kasich campaigns. We expect to compete with both the Trump and Cruz campaigns in the remaining primary states.

Also on Sunday night, Cruz’s campaign manager Jeff Roe also released a statement revealing a parallel strategy.

Having Donald Trump at the top of the ticket in November would be a sure disaster for Republicans. Not only would Trump get blown out by Clinton or Sanders, but having him as our nominee would set the party back a generation. To ensure that we nominate a Republican who can unify the Republican Party and win in November, our campaign will focus its time and resources in Indiana and in turn clear the path for Gov. Kasich to compete in Oregon and New Mexico, and we would hope that allies of both campaigns would follow our lead. In other states holding their elections for the remainder of the primary season, our campaign will continue to compete vigorously to win. Sen. Ted and wife Heidi Cruz will spend the day before the five state Acela primary contests — Pennsylvania, Connecticut, Maryland, Delaware and Rhode Island — in none of them, opting instead to focus on securing votes in more favorable states Indiana and Nebraska. The Texas senator will hold four events in Indiana on Monday. Wife Heidi Cruz will hold three meet and greet events in Nebraska that day in Omaha, Fremont and Norfolk.

***UPDATE***

GOP frontrunner Donald Trump continued to blast Ohio Gov. John Kasich and Sen. Ted Cruz (R-TX) Monday morning on Twitter:

Lyin' Ted Cruz and 1 for 38 Kasich are unable to beat me on their own so they have to team up (collusion) in a two on one. Shows weakness! — Donald J. Trump (@realDonaldTrump) April 25, 2016

Shows how weak and desperate Lyin' Ted is when he has to team up with a guy who openly can't stand him and is only 1 win and 38 losses. — Donald J. Trump (@realDonaldTrump) April 25, 2016

Trump’s campaign also issued a press release around 1 a.m. Monday morning: