From an op ed written by Sam Johnson, the Chairman of the House Social Security Subcommittee, for the Dallas Morning News:
... [T]he SSA needs strong leadership. The president must nominate a commissioner who is serious about helping disability insurance beneficiaries return to work. The SSA has had an acting commissioner since 2013, and that's far too long for an agency that touches the lives of all Americans.
I couldn't agree more but I would be surprised if there's a nomination before late 2018. Trump has been extraordinarily slow in making nominations to executive branch positions. He's made nominations for only 94 of the 559 key positions in his administration. By the same time in Barack Obama's first term he had made 219 nominations to key positions and, if you remember, Obama was extremely careful in making nominations. That's a major reason why the Obama Administration avoided scandal. To give you an idea how far behind Trump is in making nominations, there are 41 key positions in the Department of Defense for which no nomination has been made, including Secretary of the Army and Secretary of the Navy. Let's face it, for better or worse, Trump has no agenda for the Social Security Administration so it's a position of little interest for him. That's the case in most administrations but usually Presidents are interested in making nominations to help build their political party. The Republican Party is only a vehicle for Donald Trump. He has no concern for it as an institution. Even when the Trump Administration starts thinking of nominating someone for Social Security Commissioner, there's the issue of the term of office. Social Security Commissioners serve a set six year term of office and that six years doesn't run from the date they're confirmed. We're more than four years into the current term without anyone being confirmed as Commissioner. The current term ends on January 19, 2019. Even if Trump nominated someone tomorrow, by the time that person got confirmed, they'd have less than a year and a half in their term. My prediction is that Trump won't bother to nominate anyone until he can nominate someone for the full term that begins in January 2019. That assumes that Trump will still be in office in late 2018.
By the way, there are two other positions at Social Security needing nominations -- Deputy Commissioner and Inspector General.