Cruz has consistently attempted to paint O'Rourke as too liberal for Texas' more conservative electorate that hasn't elected a Democrat statewide since 1994.
Poll numbers for Cruz and O'Rourke have been tightening in the race's final weeks, though the latest Quinnipiac University poll showed Cruz with a nine-point lead. Ted Cruz's opponent in a closely contested race. The difference in this poll and others released by Quinnipiac in the past on this race is who was surveyed. Quinnipiac previously polled registered voters three times, finding Cruz ahead by 6 points in August, 11 in May and 3 in April. In 2016, one in eight Americans decided which candidate to vote for in the presidential election in the week before Election Day, according to a Reuters/Ipsos poll.
A representative for O'Rourke's campaign did not respond to ABC News' request for comment on Cruz's assertion.
The poll also showed Florida's Republican governor, Rick Scott, with a 1-percentage-point lead over Democratic U.S. Senator Bill Nelson.
EU's Barnier says talks on Brexit going ahead
Labour's worldwide trade spokesman Barry Gardiner said a second referendum would throw the Conservative government a lifeline. EU Council President Donald Tusk wrote that "unfortunately, a no deal scenario is still quite possible".
The singer said that he will take part in a fundraiser with Mr. O'Rourke in Austin on September 29. Independent voters support O'Rourke by 51 percent.
"During the campaign we made a real emphasis, we didn't cede any ground, and went to a lot of different meetings, put together different counsels, had leadership teams in that community, and we did a lot of specific advertising to them", said Rob Jesmer, a former executive director for the Senate GOP's campaign arm strategist who managed Cornyn's re-election campaign.
Nelson said that he is surprised by the backlash since he's supported Democratic candidates his whole life. "Let's work together to lead the way on healthcare, education, and immigration reform".