However, he added it was impractical to suggest George Osborne could act without international support.
Fire officials have described the testing as reliable, and said it was impractical to clean the trucks.
As for the idea that the focus must be solely on reducing plastic consumption, Mr. Khan said it was impractical to imagine a world without plastic.
But other legal experts argued that signing statements were lawful and appropriate because it was impractical to veto important bills over small problems.
Daniels said it was "impractical to impossible" to minimise the hanging points in the storage closet, saying "it is a room that probably should not have been open".
Picking through DNA for tiny aberrations was so costly and time-consuming that it was impractical to take on for an entire family.
Recalling her days as a housing activist, she said it was impractical to formulate a serious affordable housing plan without the industry's participation.
But when Dolours moved to the Irish Republic and the Northern Ireland secretary, Jim Prior, cancelled her residence requirement because it was impractical to force her return, Thatcher wrote on the letter: "I think the decision is wrong".
But it was impractical to accommodate on-site all interested relatives of the 168 people who died in Oklahoma City, and many of them would be hard pressed to make the journey to another state in any case.
When the city adopted recycling 11 years ago, the feeling was that it was impractical to ask New Yorkers, with their tight living spaces, to sort their trash into 8 or 10 piles.
While it was impractical to address the allegations during the campaign, it is at least possible to carry out a vote-by-vote recount to clear some of the doubts.
