Former US President Donald Trump on Saturday released a new campaign video.

The video ad builds on the thousands of people, including 31 Americans, killed by Hamas in Israel since October 7, and slams US President Joe Biden's release of billions of dollars in funds to Iran.

The campaign video, claims, "Trump played hardball with Iran. Destroyed ISIS. Kept the Middle East at peace. Kept us out of endless wars with strength."

"History shows very plainly that evil only respects one thing - unyielding strength," Trump can be heard saying. "When I'm back in the White House, our enemies will know: If you spill a drop of American blood, we will spill a gallon of yours."

Trump's statement about "a drop of American blood" was made at the end of October, at a rally in New Hampshire.

At that rally, Trump said, "On the terrible morning of October 7, the world saw the battle between Israel and Hamas once again. It's not a battle between two equal sides, it's a battle between good and bad, it's a battle between civilization and savages."

He added, "All those who joined the jihadist rallies, come 2025, we will find you and we will deport you."

Turning to Hamas, he warned: "If you try to kill our citizens, we will kill you. If you spill a drop of American blood, we will spill a gallon of yours."