With President Barack Obama set to make a prime-time address Thursday evening, former President Bill Clinton gave an approving nod to Obama's plans of using executive action on immigration, according to Bloomberg.

On Wednesday, Clinton suggested the president was on "pretty firm legal ground" for his executive action plans on immigration, a move that previous presidents have also made, he said.

"As far as I can tell every president in the modern era has issued some executive action on immigration, so I imagine he'll be on pretty firm legal ground," Clinton said at an event to honor The New Republic magazine's 100th anniversary celebration.

During the last overhaul of U.S. immigration policy in 1986, Presidents Ronald Reagan and George H.W. Bush had extended amnesty to family members excluded from the plan, according to the Associated Press.

"The president's going to make his immigration comments tomorrow," he said according to a transcript published by the magazine. "As far as I can tell, every governor-every president in the modern era has issued some executive orders affecting immigration. So I think it-I imagine he's on pretty firm legal footing."

Clinton's remarks come on the eve of Obama's announcement Thursday where he's expected to protect about 5 million undocumented immigrants from deportation, The Hill reported.

While Republican lawmakers have warned Obama that taking executive action on immigration might poison relations with the new GOP led legislature, Democrats are pressuring him to deliver on his promise to reduce deportations.

"In a world where borders look more like nets than walls, we are interdependent, whether we like it or not," Clinton continued.

"There was this sense of possibility in our country," he added later in his speech. "We have got to recover that. And we have to understand, in my opinion, that immigration reform is a part of that. ... Do we have to have fair rules? Do we have to make people wait in line, do you not want people jumping? Yeah, all of that's true. But the more prosperous our neighbors get, the less illegal immigration we'll have and the more we'll want people to come here and, if they get an education, to stay here, particularly, and contribute to us. So I'm looking forward to what will be said tomorrow."

Meanwhile, although Hillary has stated that she will make a decision about a 2016 presidential bid by the end of the year, some Democrats have questioned whether Obama's action on immigration will affect her chances during the election cycle.