Cruz mocked his presidential rival for dropping out of the conservative gathering.
Trump also continued his attacks on "little Marco" and "lying Ted."
"The votes are in Kansas not Washington," the former Speaker wrote.
"Ohio grassroots activists and moms know better," she said.
He pledged to "continue to work behind the scenes" to stop Trump.
"Donald Trump has no business thinking he is Tea Party," Jenny Beth Martin said.
He will be campaigning in Kansas instead.
"It’s a strategy people can use ... it's better to win races and accumulate delegates.”
"Whatever crazy can happen seems to."
Donald Trump is speaking at a campaign rally in Warren, Mich.