UPDATE 1-Trump says he will sign immigration order with road to citizenship for 'Dreamers'

(Adds details, reaction)

July 10 (Reuters) - U.S. President Donald Trump said on Friday he will sign an executive order on immigration in the next few weeks with a road to citizenship for migrants who are in the United States illegally but arrived in the country as children.

In an interview with Spanish-language TV network Telemundo, Trump said one aspect of the measure will involve Deferred Action for Childhood Arrivals (DACA), the program that protects hundreds of thousands of such immigrants - often called "Dreamers" - from deportation.

"I'm going to do a big executive order. ... And I'm going to make DACA a part of it," Trump said. "We're going to have a road to citizenship."

The U.S. Supreme Court last month dealt a major setback to Trump's hardline immigration policies, blocking his bid to end DACA, which was created in 2012 by his Democratic predecessor Barack Obama.

The ruling did not prevent Trump from trying again to end the program. But his administration may find it difficult to rescind it - and win any ensuing legal battle - before the Nov. 3 election in which he is seeking a second term in office.

Trump's remarks drew an immediate rebuke from his fellow Republican, Senator Ted Cruz, who wrote in a Twitter post that "it would be a HUGE mistake if Trump tries to illegally expand amnesty."

"There is ZERO constitutional authority for a President to create a "road to citizenship" by executive fiat," Cruz wrote. (Reporting by Mohammad Zargham and Eric Beech in Washington Editing by Sonya Hepinstall)