Democrats are targeting Texas in the 2020 election as a "Texodus" of Republican members of Congress deciding not to stand again is already underway.

It has long been anticipated that the changing demographics of Texas, a Republican bastion with a quickly rising Hispanic population, could turn the state "blue".

But the process may be accelerated by reaction to the mass shooting in El Paso that claimed 22 lives, and injured dozens more, on Aug 3.

On Saturday it emerged that the gunman, Patrick Crusius, 21 told police he was "targeting Mexicans". He carried out the shooting a a Walmart store popular with Hispanic families.

Ahead of the 2020 presidential race there has been much focus on whether Democrats can retake "rust belt" states like Pennsylvania, Ohio, Michigan, and Wisconsin, that Donald Trump won in 2016.