If officials in the United States get their way, a day trip to Montana could become more expensive.
The Department of Homeland Security wants Congress to authorize the study of a fee that could be collected from everyone who enters the U.S. at land crossings bordering Canada and Mexico.
But Canada's Department of Foreign Affairs and International Trade thinks a fee to simply enter the U.S. would be bad for business between the two countries and said it will fight the proposal.
The 2014 Department of Homeland Security budget proposal seeks increases in existing fees charged for services, including fees that air and sea travellers must pay when they enter the country.
But the agency also wants to study the feasibility of collecting a land border crossing fee for pedestrians and passenger vehicles along the northern and southwest borders of the United States.
No fees have previously been imposed on those who enter by car, bus or train.
The budget doesn't suggest how much the fee would be. The study is to be completed within nine months.