U.S. Acting Secretary of Defense Patrick Shanahan on Tuesday resigned his post and withdrew from consideration for the currently vacant post of defense secretary.

U.S. President Donald Trump announced the resignation via social media, saying that Shanahan would not go forward with the nomination process to spend more time with his family.

The post of Acting Defense Secretary will now be filled by Dr. Mark T. Esper, who will move from his current job as Secretary of the Army.

“I thank Pat for his outstanding service and will be naming Secretary of the Army, Mark Esper, to be the new