TOKYO (Reuters) - Japan's foreign minister has given up on a plan to visit Washington, the government's top spokesman said -- a trip that was meant to help smooth over a feud about U.S. military bases ahead of U.S. President Barack Obama's visit to Tokyo next week.

The two governments have been unable to fix a time for Foreign Minister Katsuya Okada to meet U.S. Secretary of State Hillary Clinton, because of Okada's busy schedule in parliament, the top government spokesman told reporters on Wednesday.

"We discussed this with the United States, but in the end it turned out to be difficult because of the Japan-side schedule," Chief Cabinet Secretary Hirofumi Hirano told reporters.

"The visit to the United States is canceled."

He denied that there would be any effect on relations between the two allies. Washington and Tokyo disagree over a number of security issues, particularly the location of a U.S. Marine base on the southern island of Okinawa.

Prime Minister Yukio Hatoyama's Democratic Party toppled the long-ruling conservative government in August. Pre-election pledges included a review of ties with the United States, sparking concern among investors about the half-century old alliance.

(Reporting by Isabel Reynolds; Editing by Edwina Gibbs)