President Trump said Thursday that a "comprehensive" executive order on immigration will be coming "next week."

"We'll be doing an executive order sometime next week, yes," Trump said at the White House Thursday.

Trump did not explain what will and will not be addressed in his executive order, but claimed it "will talk about everything and it will be quite comprehensive."

In just three sentences Monday, Trump sparked a nationwide controversy with comments that he has already started the process of striking birthright citizenship from the 14th Amendment.

"It’s in the process. It’ll happen, with an executive order ... We’re the only country in the world where a person comes in and has a baby, and the baby is essentially a citizen of the United States,” Trump told Axios Monday. “It’s ridiculous. It’s ridiculous. And it has to end."

[Related: Susan Collins pours cold water on Trump’s birthright citizenship move: 'Courts would rule against']

Whether or not the executive order Trump said will come next week includes ending birthright citizenship is unclear.

Trump did say that one of his main goals is to end the practice of "catch and release," a problem he attributed to Democratic laws and judges.

"We will end catch and release. We're not releasing any longer. We also must finish out job that we started by being strong at the border. When we're strong at the border people will turn away and they won't bother. You will see it in a year from now or certainly a period of time from now, despite that some of them come to our border and I can't blame them for that, but you have to do it legally," Trump said.

Trump said Wednesday that he is sending up to 15,000 troops to the border before the first caravan arrives. The president said the troops are necessary to ensure that the United States is "not letting them in."