Donald Trump is never one to shy away from controversy, but this week has been off-the-scale. Even for him.

Arguably, the turning point was when he criticised the Muslim parents of a soldier who died fighting for America.

Khizr Khan, who's son was killed in Iraq in 2004, spoke out against the Republican nominee, saying he had "sacrificed nothing and no one".

Trump is known for being sensitive to criticism, and so, he went straight in on the offensive.

Let's just say his reaction didn't win him any new friends.

So who's he fighting with now?

The President of the United States

Nobody in an American election is backwards about coming forwards to criticise the other side.

But historically, while the President does get involved backing their candidate, they don't tend to really let rip.

It hasn't happened since 1953.

But Barack Obama has hammered Trump in the strongest possible way.

He argues: "The Republican nominee is unfit to serve as president and he keeps on proving it."

The BBC's Emilio San Pedro specialises in US politics and says 'it is the strongest condemnation by an outgoing president of a leading party's nominee'.

Obama says that while he has disagreed with other Republicans on policy in the past, he always thought they would "observe basic decency... but that's not the situation here".

It's worth noting, he didn't attack anyone on this scale when he was running for election himself.

Trump has immediately hit back.

He says: "Well he's a terrible president.

"He'll probably go down as the worst president in the history of our country. He's been a total disaster."

The Republican Party

You know, his own side.

It's never exactly been a love-match between Trump and the Republicans, but things seem to be spiralling.

Remember: these people have always supported his party.

Congressman Richard Hanna has become the most senior Republican to say he's going to vote for Hillary Clinton. He says Trump 'cannot lead this country'.

Republican author Dr Jan Halper-Hayes says she used to be a 'big defender' of Trump. Now she's calling him 'psychologically unbalanced' and 'out of control'.

Republican fundraiser and businesswoman Meg Whitman says she's going to make a 'substantial' contribution to Hillary Clinton's campaign because she thinks Trump is a threat to democracy.

Donald Trump isn't doing much to woo back senior Republicans.

The party's top official Paul Ryan is up for re-election and Trump is refusing to endorse him.

He say he hasn't decided yet: "We need very, very strong leadership. And I'm just not quite there yet."

Which may, or may not, be related to the fact that Paul Ryan put out a statement supporting the Khan family after Trump's clash with them.

France

President Hollande is the latest world leader to make his feelings clear on some of the things Trump's said.

He says: "His excesses make you want to retch.

"If the Americans choose Trump, that will have consequences, because an American election is a world election," he added.

The Simpsons

Wow. Talk about kicking a man when he's down.

Forgot politicians and world leaders, this is serious stuff.

Marge and Homer are with Hillary.

There's a standalone clip showing them deciding how to vote.

Warning: Third party content may contain adverts.

It's worth watching just to see how cartoon Trump gets ready to face his public.

A baby

Donald Trump had an new adversary at a rally in northern Virginia.

A crying baby.

At first, he reassured the mother: "Don't worry about that baby, I love babies.

"I hear that baby crying, I like it. What a beautiful baby.''

But when the child carried on he said: "Actually, I was just get kidding. You can get that baby out of here!''

Democracy itself

According to Donald Trump the election in November is 'going to be rigged.'

He says some people without proper ID "are going to walk in, they are going to vote 10 times maybe. Who knows?"

So if he doesn't win, it's not his fault.

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