Chaser crashes PM western Sydney visit

The Chaser comedians have gatecrashed the prime minister's campaign visit to western Sydney, following him with a cardboard cut out of Tony Abbott.

Malcolm Turnbull was walking out of McCarthy Catholic College in Emu Plains on Monday when Chas Licciardello from the satirical comedy group approached him and yelled: "I trust you".

He then fell backwards on the floor in front of the prime minister.

"I can't believe you let me drop," he yelled.

"I thought I could trust you. You told me I could trust you."

Mr Turnbull laughed the stunt off and continued walking to his car.

But the ABC crew caught up with him again as he finally got around to a street walk in Penrith, following him through a mall with the cardboard cut-out of his predecessor.

"I'm just helping out Malcolm, he said to bring this along," Chaser crew member Craig Reucassel said as he followed Mr Turnbull around Penrith Westfield.

"He knows he looks better if he's got Tony behind him. What if he forgets where his policies come from."

Reucassel then told Mr Turnbull's security staff they'd get their "ass kicked" for blocking him.