BOSTON -- Pat Buchanan, seeking support for his fledgling Reform Party presidential bid, promised Thursday to lead a "millennial struggle" against an emerging world government "where all nations yield up their sovereignty and fade away."

In a speech to the Boston World Affairs Council, the former Republican said, "Loyalty to the New World Order is disloyalty to the Republic. In nation after nation, the struggle between patriotism and globalism is under way."

Buchanan, in his third run for the presidency, said the Clinton administration is allowing the United Nations to intrude on America's sovereignty. At the same time, he said, the United States is guilty of "trampling on the sovereignty" of other nations by injecting troops in internal conflicts, such as Kosovo.

"If ever sovereignty becomes obsolete, we may expect America's involvement in endless wars until, one day, we pay a horrific price in some act of cataclysmic terror on our own soil," Buchanan said. "For interventionism is the spawning pool of international terror."

Buchanan left the GOP last year to seek the Reform Party nomination after his initial 2000 presidential bid as a Republican stalled. He blamed the Republican establishment for his failure, saying party leaders were lining up behind the front-runner, Texas Gov. George W. Bush.

New York tycoon Donald Trump also is seeking the Reform nomination.

Buchanan named politicians, journalists and Clinton administration officials who appear to embrace globalism over nationalism -- proponents of the so-called "New World Order," a phrase Buchanan attributed to Bush's father, former President George Bush.

Buchanan's examples included President Clinton calling himself a "citizen of the world," and Vice President Al Gore -- a candidate for the Democratic presidential nomination -- agreeing to a global environmental pact. The United Nations is increasingly seeking authority over U.S. troops and control of the nation's borders, Buchanan warned.

"This then is a millennial struggle that succeeds the Cold War: It is the struggle of patriots of every nation against a world government where all nations yield up their sovereignty and fade away," he said.

"My vision is of a republic, not an empire -- a nation that does not go to war unless she is attacked, or her vital interests are imperiled, or her honor impugned. And when she does go to war, it is only after following a constitutional declaration by the Congress," Buchanan said. "We are not imperialists; we are not interventionists; we are not hegemonists; and we are not isolationists. We simply believe in America first, last and always."