What is a term or idiom for "blah blah blah" talk?

I am looking for a term or and idiomatic expression to convey the concept of "empty, irrelevant" talk. I am thinking about those situations in which people want to express their ideas on facts about politics, economics, religions etc, but they have no real information about what they are talking about so they often repeat phrases they heard on TV programmes or comment using set phrases like: "that's the way things are".

He is always commenting on the US election campaign but what he says is just....(the expression I am looking for)

Solution 1:

Similar to another answer, I'd suggest "blather".

Consider:

What are you blathering on about?

and your

He is always commenting on the US election campaign but what he says is just blather!

Solution 2:

The term prattle comes to mind (often) when announcers are trying to fill a 24 hour news cycle with 24 minutes of news. I think it would also apply to people repeating what they heard.

Definition from google: talk at length in a foolish or inconsequential way. "she began to prattle on about her visit to the dentist"

Solution 3:

Well, there's the old favorite claptrap:

Absurd or nonsensical talk or ideas: such sentiments are just pious claptrap

Origin:

Mid 18th century (denoting something designed to elicit applause): from clap + trap.

Given the rather direct etymology it's almost a perfect fit to political jaw-flapping.

Solution 4:

Noise

He is always commenting on the US election campaign but what he says is just....noise.

From Merriam-Webster Online definition 2.e

irrelevant or meaningless data or output occurring along with desired information