Major cruise lines that operate in Alaska have sued the state on Friday, saying the head tax levied by the government was unconstitutional. 

The lawsuit was filed by the Alaska Cruise Association, which represents Royal Caribbean Cruises, Carnival Corp, Norwegian Cruise Line and the like.

Cruise lines are looking for respite from $46 of the $50 per passenger head tax, which includes a $4 fee to run an environmental monitoring program.

The lawsuit says that the tax is unconstitutional as it discriminates against interstate commerce and uses money collected from the head tax for unrelated purposes.

Speaking his mind, John Binkley, President of Alaska Cruise Association, said, "We feel that the entry fee as implemented is illegal, and that Alaskans are being hurt by the tax."

Dan Sullivan, Alaska Attorney General, said that THEY WOULD fight the lawsuit.

It is important to note here that the concerned fee was approved by the Alaska voters in 2006.