As it happened: Trump impeachment trial: Democrats invoke Hamilton in opening arguments - BBC News
The Democrats opened their case against the president by invoking Alexander Hamilton and his fear of abuse of power.
Why is Trump weighing in from Switzerland?

There was one thing in particular that Trump said which was kind of like a red rag to a bull.

It's when he said basically: "Well things are going very well, we have all the information, and they [Democrats] have none of it."

Well, if you want a fair trial, then maybe that information should be made available.

We keep using the word "trial", and the words "jurors" and "witnesses" and "evidence", but we must not lose sight that this is a political process.

We saw that clearly last night when the first votes started coming in. In a vote that split completely along party lines, 53 Republicans said "no we should not be able to subpoena the White House for documents", while 47 Democrats said "yes we should".

So we have Donald Trump kind of goading and saying: "Look I've got the information. We know what happened, but we're not going to tell you."

I think this might inflame public opinion. Polls are already indicating that a clear majority believe that evidence should be handed over and witnesses should be called.

Are journalists overstating the significance of all this?

Politicians always over-estimate the extent to which the general public are paying attention to their words.

It is a condition not unique to the United States of America. It is a global phenomenon that whatever politicians say, they think the public will find tremendously important and fantastically interesting.

But, amazingly, members of the public are getting on with their lives.

That is an important thing to bear in mind. Some of us - obsessive forlorn political journalists like me - are watching in immense detail, while other people are just getting on with it.

Some people will be watching this for its historical important. But for the overwhelming majority of Americans, I expect there to be just a few fleeting moments of attention paid to the serious discussion taking place in Washington.

It doesn't seem to be changing the lives, or minds, of the American people all that much.