The size of Trump's victory margins Tuesday were stunning.
"Frankly, they have no path to victory," he said.
Clinton offered an olive branch to supporters of rival Bernie Sanders.
Sanders appealed to superdelegates to switch their support to him.
Trump won all five states up for grabs on Tuesday.
"The media is going to say Donald Trump is the Republican nominee.”
"Sanders won't have the real estate to catch up given the size of our lead in pledged delegates and the popular vote."
The super-PAC has spent more than $16 million against the front-runner.
Trump is expected to win big in Tuesday primaries.
The Trump and Clinton campaigns are trading attacks.