Justin Trudeau responded late Wednesday to remarks from fellow leadership contender Marc Garneau who said the young politician is all charisma and no substance.

Trudeau said he was "very proud of the campaign I've run" and that he's spoken substantively on many issues from foreign aid to democratic reform.

Garneau - known for his mild manner - didn't mince words Wednesday during his morning event or his interview on Battleground when he said Trudeau lacks depth on the issues.

"As Liberals, we cannot wait until after the leadership race is over to find out what we signed up for," he told reporters at in Ottawa.

"Justin has stated that now is not the time to tell Liberals, to tell Canadians, where he stands and what his plan is for the country. He has said he will do that after the Liberal leadership race - sometime before the next election in 2015. In my opinion, this is the same as asking Canadians to buy a new car without test-driving it first."