VIETNAMANNOUNCEMENT SET

After more than a week of internal debate and White House leaks, President Clinton has decided to announce his plan to establish full diplomatic relations with Vietnam at a Rose Garden ceremony Tuesday. Storm coulds are already gathering, at least among Republican presidential candidates. Senate Majority Leader Bob Dole and Sen. Phil Gramm of Texas have criticized Clinton for moving toward normalization; Rep. Bob Dornan (R-Calif.), who may soon withdraw from the race, on Sunday called Clinton a "triple draft dodger" and told NBC's "Meet the Press" that establishing diplomatic ties was "going to deny him a second term for sure." But Clinton will have formidable support Tuesday: Sen. John McCain (R-Ariz), a former Navy pilot who spent six years in aHanoi prisoner-of-war camp.Said McCain Sunday: "I would like for Sen. Dole to let us end this one."