Hillary Clinton is amplifying her attacks on Donald Trump as someone unfit to have his finger on the nuclear button, blasting his 'hair-trigger' temper and bringing former nuclear bunker officer who warned he would have 'no faith' in Trump to her rally.

Clinton released a new campaign ad on Monday that raises fears of how Trump might respond to a crisis, and warned at a campaign rally brought up 'mass annihilation' of human beings while castigating her rival for his comments.

She continues to hit Trump for his comments on the use of force.

'To talk so casually, so cavalierly about mass annihilation is truly appalling,' she said.

GIMME SHELTER: Clinton is warning that Donald Trump is a dangerous person to control the nation's nuclear arsenal, and brought a missile control officer to introduce her at an Ohio rally

Clinton referenced quotes from Trump where he would't rule out use of nuclear weapons and spoke about bombing adversaries. 'To talk so casually, so cavalierly about mass annihilation is truly appalling,' Clinton told the Ohio crowd.

'When the president gives the order, that’s it. There’s no veto for congress. No veto by the Joint Chiefs [of staff]. The officers in the silos have no choice but to fire. And that can take as little as four minutes,' Clinton said.

Clinton was introduced by Bruce Blair, a former Intercontinental Ballistic Missile Launch Control Officer, who is featured in a Clinton campaign ad raising doubts about having Trump's finger on the nuclear button.

'Donald Trump would have the power to single handedly launch a nuclear strike on his own at any time he chose with a single phone call,' said Blair, who said he spent years working in an underground silo during his 20s.

Clinton issued the stern warning at Kent State University in Ohio, a campus known for the shooting of four students during Vietnam War protests in 1970

At that time, Blair said, he was ready to fire up to 50 nuclear missiles from the underground bunker.

Blair was met with sounds of confusion when he first introduced himself to a room packed with students, on a campus still associated with the incident when National Guardsmen fired upon protesting students in 1970.

'If I were back in the launch chair I would have no faith in his judgment, none and I would live in constant fear of his making a bad call,' said Blair.

'When I sat alert in the underground bunker, the president and only the president could give me and my fellow missiliers the order to launch. Only at his order would we turn the keys to fire those missiles,' said Blair, who is featured in a Clinton campaign ad called 'Silo.'

The 50-some nuclear missiles under his supervision could reach their targets in 30 minutes or less. The decision to order such a strike 'requires enormous composure and competence,' he said.

Clinton is channeling Lyndon B. Johnson in a last-ditch effort to defeat a surging Donald Trump, warning that her Republican opponent is too unstable to have his finger on the button.

Clinton released a remake today of Johnson's 1964 ad, 'Daisy,' that uses the same actress, Monique Corzilius Luis, to remind voters of the perils of nuclear war.

'The fear of nuclear war that we had as children, I never thought that our children would ever have to deal with that again, and to see that coming forward in this election is really scary,' Luis states, direct to camera.

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Hillary Clinton is channeling Lyndon B. Johnson in a last-ditch effort to defeat a surging Donald Trump, warning that her Republican opponent is too 'unstable' to have his finger on the button

Clinton released a remake today of Johnson's 1964 ad 'Daisy' that uses the same actress, Monique Corzilius Luis, to remind voters of the perils of nuclear war

'The fear of nuclear war that we had as children, I never thought that our children would ever have to deal with that again, and to see that coming forward in this election is really scary,' Luis states, direct to camera

Clinton's commercial ends with a clip from Morning Joe of host Joe Scarborough asking what 'safeguards there are' to keep a president who 'may not be stable' from deploying the country's nuclear weapons.

Former CIA director Michael Hayden tells him, 'The commander in chief is the commander in chief.'

Much of the voting population was not alive when the controversial Johnson ad aired.

The Democrat showed the commercial one time, but it is historically credited as having won him the '64 election against his Republic challenger, Barry Goldwater.

The Clinton commercial goes after Trump directly, flashing pictures of the White House contender throughout the second half of the 30-second spot

Johnson's spot made no mention of Goldwater. The connection was implied, as Johnson had went after Goldwater in the election for playing fast and loose with the nuclear codes.

That ad shows a three-year-old Luis, then Corzilius, pulling petals off a daisy, followed by a missile launch countdown and nuclear explosion that creates a mushroom cloud.

'These are the stakes,' Johnson says in a voiceover. 'To make a world in which all of God's children can live, or to go into the darkness. We must either love each other, or we must die.'

A narrator tells viewers to vote because 'the stakes are too high for you to stay home.'

Clinton's commercial ends with a clip from Morning Joe of former CIA director Michael Hayden saying, 'The commander in chief is the commander in chief'

The Clinton commercial goes after Trump directly, flashing pictures of the White House contender throughout the second half of the 30-second spot.

Clinton's only likeness in the commercial is at the beginning as she states the mandatory, 'I approve this message.'