(CNN) - Sen. John McCain took his weeklong environmental tour to Washington state Tuesday, addressing the need for reducing the nation's dependency on foreign oil and sparking investment in environmentally friendly technology.
McCain spoke at an environmental roundtable at Cedar River Watershed Education Center in North Bend, Washington.
Washington is among several potential battleground states in the West - including California, Colorado, New Mexico, Nevada and Oregon - where voters count the environment as a top issue.
McCain said Tuesday that coming up with new forms of clean energy is "a national security issue when we're dependent on more than $400 billion a year in imported oil from countries that don't like us very much ... some of that money is helping terrorist organizations."
The Arizona senator also said the heightened awareness of global environmental concerns could help push new forms of energy to the forefront of the nation's political agenda.
"Environment, national security and economy are all coming together, perhaps ... to spark ... an incredible impetus for us to sit down together, Republican and Democrat, environmentalists, business and bankers and retailers ... all together and address this problem."