U.S. Sen. John McCain (R-AZ) said he is concerned after Phoenix Health Plans Inc. announced that it will leave the Affordable Care Act, also known as Obamacare, marketplace in Arizona for 2017, leaving only one provider in the health care program for residents of Maricopa County next year.

Maricopa County is the most populated in the state. McCain said that in 2016, residents of the county had eight health insurance options.

The news about Maricopa County comes after Pinal County became the first county in the country to have not even one provider in the health care marketplace, McCain said.

McCain said he believes that the current health care plan is crumbling and should be replaced. He sent a letter asking the Obama administration how it plans to address the coverage gap that may occur in Pinal County next year since Aetna decided to leave the health care marketplace as well.

McCain introduced legislation to repeal and replace the current health care marketplace with solutions he feels would "put patients back in charge of their health care decisions."