'I mean, look, if it's all through livestream, I'm not going to be watching it,' Vance told reporters as he traveled to Lima, Ohio for a campaign rally. 

Hasan, a former Army psychiatrist, shot and killed 12 soldiers and one civilian at the Fort Hood, Texas base on November 5, 2009 as part of a planned Islamist terror attack.

Vance described Hasan's attack as 'the worst terrorist attack on American soil outside of 9/11.'

'He took them at their most vulnerable and gunned them down these people where they lived,' he said. 

Acting Secretary of the Army Hon. Adam Telle directed Tuesday the execution of Nidal Hasan by firing squad, after President Donald Trump approved the death sentence for his crimes.

The president has the sole authority to approve a death sentence for a military prisoner.

Hasan was found guilty of all 42 counts by a court-martial jury on August 23, 2013 and sentenced to death days later.

Secretary of War Pete Hegseth revealed in an interview with Real America's Voice on Thursday that Hasan would be publicly executed by firing squad.

'We'll make sure that people are able to watch it, that it's public,' Hegseth said.

'People need to understand that there's serious consequences for these types of things.'

Hegseth's comments drew bipartisan criticism from elected officials and human rights organizations.

The UN human rights office said on Friday that broadcasting the killing 'is tantamount to a public execution and would breach the absolute prohibition of torture.'