Cruz: Obama's Cuba trip will 'legitimize' Castro regime
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Republican presidential candidate Ted CruzTed CruzCruz: 'Schumer and the Democrats want a shutdown' Kansas Republican sworn in after special election Overnight Finance: Dems want ObamaCare subsidies for extra military spending | Trade battle: Woe, Canada? | Congress nears deal to help miners | WH preps to release tax plan MORE is criticizing President Obama for his trip to Cuba, saying Sunday the president's trip will "legitimize the corrupt and oppressive Castro regime."

"On Sunday, President Barack ObamaBarack ObamaThe outdoor recreation economy is a force that is here to stay Dems crowd primaries to challenge GOP reps White House appears to inflate job creation stats on first 100 days site MORE, a retinue of celebrities in tow, is expected to arrive in the Cuban capital to hang out with Raúl Castro and his henchmen, all of which will be breathlessly documented by the media mavens along for the ride," Cruz wrote in the piece published in Politico with the title, "In Cuba, Obama Will Legitimize the Corrupt and Ignore the Oppressed."

He also tweeted about the president's trip, pushing out a link to his piece. 

"Meanwhile, political prisoners languishing in dungeons across the island will hear this message: Nobody has your back. You’re alone with your tormentors. The world has forgotten about you."

Cruz said Castro denies the existence of the political prisoners.

"There will be no mojitos at the U.S. Embassy for them," he wrote.

There are more than 100 long-term "prisoners of conscious" in Cuba, he wrote, according to news reports. But he noted the Castro regime does not allow international organizations to have access to its prisons, so the number is hard to determine.

"But we know they are there and that hundreds are held for shorter periods, and beaten in prison regularly," he said.

In his piece, the Texas senator said there were 1,141 Cubans detained for political reasons last month according to the independent Cuban Commission for Human Rights and National Reconciliation.

"So sycophancy is having the effect is always does: It is telling our enemies that they can behave with impunity," he wrote.

Cruz wrote that his father was Cuban and was "beaten and tortured by Batista's regime." But his father and his aunt, who were "brutalized by Castro's thugs," found freedom in the United States.

"That freedom can come to Cuba, and I pledge to work to make it so. But it cannot happen by enriching and empowering the dictatorship, while they export terrorism throughout Latin America," he wrote.

"And it cannot happen by forgetting the heroism and suffering of the brave souls who have opposed the Castros for so many decades."

Obama landed in Cuba with his family Sunday afternoon. He is the first sitting president to make the trip to the Communist island nation in nearly 90 years. During his trip, he's expected to meet with Castro and give a speech in Havana.

GOP front-runner Donald TrumpDonald TrumpFormer State Department adviser announces run for Maryland governor Rob Thomas: Anti-Trump celebs have become 'white noise' Carl Bernstein: Flynn is ‘central to what FBI believes is cover-up’ MORE also weighed in on the Cuba visit, tweeting Sunday evening about the fact that Castro was not at the airport to meet Obama.