The government has invoked national security to close the hearings.

Still, the government did invoke special powers, dating from 1976, to ensure that supplies of fuel are distributed.

The government invoked an exemption to the act.

Where uniform standards are warranted, national government could invoke the provisions of the Constitution which deal with conflicting laws.

Instead, he said, the government had simply invoked the general principle that controlled substances are dangerous.

The contract was due to run until 2013, but the government invoked a six-month break clause.

The Canadian federal government has never invoked it, and some have speculated that its use would be politically costly.

As a result, the government invoked a state of emergency which lasted until January 2006.

Usually, lawsuits are dismissed when the government invokes the privilege.

The panel said that only governments and diplomats could invoke the Convention, not individuals.