A former General Motors CEO endorsed Democratic presidential nominee Hillary Clinton in an opinion piece published in the Washington Post on Thursday, but made no mention of the Obama administration's massive bailout of the auto industry, or the role he played in it.

In the article, titled "I've always voted Republican. Until Now," Daniel Akerson stated that Donald Trump "has demonstrated neither the capacity nor the inclination to learn from experts in global economics." His byline states he served as "chairman and chief executive of General Motors from 2010 to 2014 and was vice chairman and special adviser to the board of directors for the Carlyle Group from 2014 to 2016."

However, Akerson's earlier role in the company is omitted. According to a 2009 article by the same newspaper, Akerson was appointed to GM's board of directors in July of that year to represent the Treasury Department, which then owned 61 percent of the company. He was paid $200,000 a year in that position.

The federal government ended up losing $11.2 billion in the bailout of GM, which began under the Bush administration as a temporary bailout that was greatly expanded by the Obama administration, according to Bloomberg.

Clinton has said she is a staunch supporter of the auto industry, and has stressed her support for the 2009 bailout.

Akerson's endorsement comes after a concerted effort by Clinton in recent weeks to win over blue-collar union workers who had previously always supported Democrats after many of them switched sides to vote for Republican presidential nominee Donald Trump.

He wrote that Trump "simply lacks the competence to serve as president of the United States," but said "Clinton has been tested. She has demonstrated balance, calm and an even temperament."

"Like other leaders, including myself, she has made mistakes. I believe she has learned from those mistakes. In my opinion, she is ready to be commander in chief on Day One," he wrote.