Immigration Reform continues to be one of the most controversial issues that the United States is facing today. President Obama's executive actions on deferred action for immigrants have been hotly contested by legislators. Just recently, 43 GOP Senators filed an amicus brief to the Supreme Court. This follows the House of Representatives' own amicus brief that they filed last month.

The amicus brief filed by legislators aims to block Obama's executive actions that were first introduced last November 2014, specifically the Deferred Action for Parental Accountability (DAPA), which was expanded to include Deferred Action for Childhood Arrivals (DACA). The amicus brief filed by the Senators is the latest development in the case, United States v. Texas, which was first filed last Nov. 20, 2015.

According to the brief filed by the 43 Senators, including Senate Majority leader Mitch McConnell, Obama's executive actions are found to be in contradiction to the immigration laws stated in the Constitution.

"The Executive has a constitutional duty to faithfully execute the immigration laws and, in so doing, may implement rules for the administration of those laws. Yet Congress has never given the Executive unchecked discretion to rewrite federal immigration policy or to fashion its own immigration code. In this case, the executive sought to do precisely that by granting "lawful presence" – and the governmental benefits that come with it – and work authorization to over four million aliens who are illegally present in the United States," the brief states.

While select members of the House of Representatives and the Senate continue to fight against Obama's executive actions, their actions continue to be criticized by pro-immigration reform groups.

Last March, Politico obtained a letter addressed to Speaker Paul Ryan from the pro-immigration groups. The letter outlines the benefits of Obama's immigration actions and reasons with the lawmaker to change his vote.

"Those executive actions represent the dreams and aspirations of millions of children, parents and families who have built lives here, who contribute to our economy and our communities and who believe in the promise of America," the letter stated.

The Supreme Court has already announced that it will pursue the case, United States v. Texas, and will hear arguments for the case on Apr. 18.