He lambasted Texas Senator Ted Cruz and Ohio Governor John Kasich over the alliance they announced late on Sunday.
Under their plan, Mr Cruz will cut campaigning in the Oregon and New Mexico primaries and Mr Kasich will give Mr Cruz a "clear path" in Indiana.
Mr Cruz said the deal was "great for Indiana and great for the country".
Speaking in Indiana on Monday, he said Mr Trump winning the nomination would hand the White House to Democratic front-runner Hillary Clinton in November's election.
Can the pact work? - Anthony Zurcher, BBC News, Washington
This announcement comes just days before Mr Cruz and Mr Kasich are likely to receive a thorough drubbing in a handful of states in the mid-Atlantic, including delegate-rich Pennsylvania.
By Wednesday morning Mr Trump could have put considerably more distance between himself and his two opponents.
So this accord may be an early effort to push the focus past the next round of voting and on to more friendly contests.
Indiana is shaping up to be a pivotal battleground. A recent poll shows Mr Trump with a comfortable lead in a three-way race that narrows considerably if Mr Kasich is taken out of the equation.
Given the rules in Indiana - 30 delegates to the candidate who wins a statewide plurality and three delegates to the top finisher in each of the state's nine congressional districts - every bit of help Mr Cruz can get to edge past Mr Trump will be invaluable.
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