Army Gen. Mark Milley is taking over as the nation’s top military officer against a backdrop of controversy over defense aid to Ukraine that has triggered a presidential impeachment inquiry at a time of persistent threats from China, Russia and Iran.

Milley, who was sworn in during a rain-soaked ceremony Monday at Joint Base Myer-Henderson, will officially become chairman of the Joint Chiefs of Staff and President Donald Trump ‘s top military adviser at midnight. And he will face what has been an increasingly difficult task: maintaining the nonpolitical nature of the U.S. military and providing blunt advice to a president who is prone to making sudden Pentagon announcements via Twitter and abruptly turning on Cabinet members who cross him.

In a brief speech Monday, Milley told Trump, “You can rest assured that I will always provide you informed, candid, impartial military advice to you.” And he vowed to maintain the high quality of the world’s preeminent fighting force.

“With the complex challenges of the international environment, the United States Armed Forces stand ready. We stand ready to keep the peace or, if necessary, win the war,” he said.

Trump, who attended the ceremony, praised Milley, saying, “Mark is living proof that the American warfighter is the toughest, smartest and bravest, best and brightest by far anywhere in the world.”

But during the ceremony, Trump didn’t seem to be all there.

First, it was raining, and we all know Trump hates the rain.

Second, the man is being impeached, and literally every hour more bad news drops for the president.

So, maybe it’s not a huge surprise that Trump was a bit out of it during the ceremony.

Take a look:

1 Pence drew the short straw as Trump’s caregiver at the Joints Chief's ceremony. Multiple loss of balance issues as Trump jerked & swayed forward & back. Slurring & reading issues. Here, Pence does his best to quietly prod Trump out of his stupor before taking him for a walk pic.twitter.com/S86AwbewU0

— Tom Joseph (@TomJChicago) September 30, 2019

2 The look in her eyes after the General keeps her from walking in front of the incoherent Trump, says it all: "He's not there" @SaysDana @MelissaJPeltier pic.twitter.com/uc4nBsaYdd

— Tom Joseph (@TomJChicago) September 30, 2019

Twitter had a field day:

Does the right side of his mouth appear to be sagging/drooping.. Has he had a stroke?

— SafetyEd2017 (@SafetyEd2017) September 30, 2019

Is his right arm / hand paralyzed ? I don't know when I noticed it but it doesn't seem Mobil at all.

— Racyo.☠️ 🦈..'Let it bleed'.. (@Feenielives4him) September 30, 2019

I'm telling everyone, Trump is drinking.
Don't @ me that he doesn't drink, he did, he does and he is.
Notice all the weight he's put on recently.
He's a drunk.

— Arizona (@EuphorbiaZ) September 30, 2019

Just a Nurse but I would say overly medicated-exhaustion-depression and panic make him unstable and dangerous

— proudAFbrat Go NOLES (@flanole) September 30, 2019

Wow. He had no idea the people next to him had walked on.

— Melissa Jo Peltier (@MelissaJPeltier) September 30, 2019

And he just stands there, flashing that doofus look like he always does & then it seems like he forgot HOW to walk, this is getting very, very bad & pathetic.

— Stacey 🙋‍♀️🆘 (@Staceymoon52) September 30, 2019