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Cruz changed his flight at 6am on Thursday after a firestorm of outrage erupted overnight. On Thursday afternoon, he released a statement saying his 'girls' had asked him if they could go away with friends the day before and the family quickly booked the trip.
He said he was just 'trying to be a good dad' by dropping them off, and that he was returning to Texas to battle the energy crisis.
But text messages obtained by The New York Times show how Heidi encouraged other mothers on the street they live on to join them.
On Wednesday morning, she wrote: 'Anyone can or want to leave for the week? We may go to Cancun there is a direct flight at 445pm and hotels w capacity. Seriously. Covid test to come back which we will take there.'
Another mother responded: 'We are now thinking along those lines. Sounds so wonderful.' Another said: We are supposed to go to Cabo Friday.'
Heidi then booked the family's flights and informed the group and told them where they planned to stay: 'Ritz Carlton. $309 plus tax.'
One of the other mothers replied: 'Cancun Cabo even Boston sounds amazing!!! I would live (sic) to go but not freezing under the down comforter with hot chilies and a hoodie and sadly I can't leave [redacted] or my mother in law.'
Heidi, a managing director in Goldman Sachs' Houston office, also asked their friends: 'Are you guys warm enough? We have a fireplace! Let us know. Our house is FREEZING tho... we couldn't stand it anymore.'
Their daughters were never referenced in the exchange.
Hours later, the Cruzes were at the airport. They left behind their dog - Snowflake - which was spotted by a reporter staring forlornly out of the front door on Thursday, before the Senator arrived back home.
In an interview on Thursday night, Ted admitted he regretted going.
'My girls said school's been cancelled, can we take a trip and go somewhere warm. And Heidi and I, as parents, we said OK, sure,' he told Sean Hannity.
On Thursday night, Cruz doubled down on the excuse, telling ABC 13 during an interview at his Houston home: 'They said, 'Look, lets take a trip. Lets go with some of our friends and lets get out of here and lets go somewhere warm. And Heidi and I said ... lets go.'
'You question what I was thinking, and ... I was trying to take care of my family.
'I was trying to take care of my kids. It's unfortunate, the fire storm that came from it.
'It was not my intention. In saying yes to my daughters to somehow diminish all the Texans that were going through real hardship.'
Cruz is shown with his wife Heidi (right) and one of his two daughters (left)
Snowflake, the Cruz's poodle, was left behind in their freezing home while they went to Mexico
Ted Cruz was fiercely criticized for his jaunt, and swiftly returned on realizing the terrible PR move.
He landed back in Houston on Thursday afternoon and said he 'regrets' flying to Cancun in the middle of the state's energy crisis for a vacation - but insisted he was 'just trying to be a dad'.
'It was obviously a mistake and in hindsight I wouldn't have done it,' he said, speaking on arrival at home in Houston.
'I was trying to be a dad.
'And all of us have made decisions - when you've got two girls who have been cold for two days, and haven't had heat or power, and they are saying: 'Look, we don't have school, why don't we go, let's get out of here.''
He added: 'I think there are a lot of parents that would be like, 'If I can do this, great.'
'That's what I wanted to do. As I said, really from the moment I sat on the plane, I began really second-guessing that decision.'
On Monday night, Cruz spoke on a radio show which airs from 5-8pm, telling the host: 'Thankfully, my home, we didn't lose power.'
This was the situation in Austin and many other parts of Texas while the Senator and his family were in sunny Mexico
The power went out at around 6pm on Tuesday, he told Hannity on Thursday.
His office previously told DailyMail.com that the power went out on Monday night.
Protesters at Houston airport held out signs as he landed on Thursday that read: '24 dead'.
Others gathered outside his home to show their anger at his jaunt.
They yelled: 'Resign!' as he spoke to local media outside his home.
He also claimed that the girls asked him 'yesterday' if they could go away, and he and Heidi 'agreed'.
Within hours they were all on the plane.
Temperatures plummeted to as low as -2F in Texas this week and snow and ice has blanketed much of the state. It has been 85 F and sunny in Cancun all week by contrast.
Cruz was slammed for both the trip and for seeming to blame it on his kids once people started criticizing him for it.
Before he released his statement, sources told Fox and The New York Times that the trip was pre-planned.
Cruz was also carrying a large carry-on which suggested he planned to stay for longer than just one night.
He later admitted he intended to stay 'throughout the weekend'.
Heidi Cruz's texts said she planned on returning to Houston on Sunday evening, landing back in the Texan city at 6pm after a four night break at the luxury Mexican beach resort.
A protester, Mary Kay Hoffman, waited for Ted Cruz at Houston airport with a sign reminding him of the death toll from storms