July 15 (Reuters) - Longer-dated U.S. Treasury yields rose and the curve between two-year notes and 30-year bonds turned positive for the first time since January, on growing bets of Donald Trump winning the presidential race after surviving an assassination attempt.

A Trump presidency would likely bring higher deficit spending, more tax cuts, higher inflation and less regulation in equities, said Gennadiy Goldberg, head of U.S. rates strategy at TD Securities in New York.

"Investors are pricing in much higher odds of Trump becoming president," he said.

The motive behind a 20-year-old gunman's attempt on the life of Trump remained a mystery two days later, with the suspect having been shot dead and the FBI unable to identify an ideology that may have driven him to attack the former president.

Benchmark 10-year yields were last up 4 basis points on the day at 4.222%, while two-year yields fell 1 basis point to 4.451%.

The inversion in the closely watched two-year, 10-year Treasury yield curve narrowed to minus 23 basis points , the smallest inversion since January, and the gap between two-year and 30-year yields was slightly positive.

Yields have tumbled in the past two weeks on increasing expectations that the Federal Reserve will cut rates as soon as September as the jobs market softens and inflation eases back closer to the U.S. central bank's 2% annual target.

Traders will be watching comments from Fed Chair Jerome Powell later in the day for any fresh clues on the likelihood of a September rate cut.

Any potential Trump victory is unlikely to change the Fed's path.

"It certainly complicates the Fed's reaction function in the wake of the election. But I think in the short term, the Fed has to react to incoming data and really incoming data has been consistent with a cut in September," sad Goldberg.

Traders are also pricing in a second and possible third rate cut by December.

(Reporting By Karen Brettell; Additional reporting by Tom Westbrook in Singapore; Editing by Arun Koyyur)