Seattle ? Democratic presidential candidate John Kerry argued on Thursday that Americans face greater dangers because of the Bush administration’s mishandling of Iraq and vowed that if elected president, he would “never let ideology trump the truth.”

“They’ve made America less safe than we should be in a dangerous world,” Kerry said as he began an 11-day campaign focus on national security. “In short, they have undermined the legacy of generations of American leadership.”

Although Kerry’s advisers promoted the speech as a major policy address, the Democrat did not stake new ground as he outlined positions he has taken on the campaign trail in recent months. He said he would provide details in the coming days.

The speech was designed to show that Kerry, a decorated Vietnam War veteran, would be strong in combatting terrorism and in his command of the military while confidence in Bush’s leadership has softened amid increasing violence in Iraq.

“Everyone outside of this administration seems to understand that we’re in deep trouble in Iraq,” Kerry told an audience of 450 invited guests, including three of his former crewmates from Vietnam and former Democratic Sens. Gary Hart of Colorado and Max Cleland of Georgia.

Republicans portrayed the speech as disingenuous political grandstanding.

“These petty, hate-filled political attacks do not make America stronger or safer,” Sen. George Allen, R-Va., chairman of the National Republican Senatorial Committee, said in a conference call with reporters. “John Kerry and the Democrats are more worried about political attacks than prosecuting the war on terrorism.”

Kerry laid out four principles that would guide his national security policy:

• New alliances with foreign countries.
• An updated military to meet terrorist threats.
• The use of diplomacy, intelligence, economic power and “the appeal of our values and ideas” to keep the country safe.
• Freedom from dependence on oil from the Middle East.

If elected, Kerry said he would send a message to the armed forces on his first day in office, promising to make them the “the best-led, best-equipped fighting force in the world.”

“You will never be sent into harm’s way without enough troops for the task,” Kerry said, echoing a complaint of Army Gen. Eric Shinseki and drawing some of the biggest applause of his speech. “And you will never be asked to fight a war without a plan to win the peace.”