WASHINGTON -- Former House Speaker Newt Gingrich said Monday there is a very good chance he'll get into the race for the 2008 Republican presidential nomination, but he won't decide until after September.

Related: Campaign Coverage

"I think right now that it is a great possibility," Gingrich said. "I don't want to get into all this stuff. I want to focus on what we have to do to make America successful."

Gingrich said he plans to hold a workshop on solutions facing the country in September, after which he'll make a decision on whether to launch a presidential bid.

He made the comments Monday on ABC's "Good Morning America."

Gingrich left Congress when Republicans lost seats in the 1998 elections after a campaign that highlighted then-President Clinton's affair with Monica Lewinsky.

Asked about former first lady and Democratic front-runner Hillary Rodham Clinton's White House prospects, Gingrich said: "I think she has a very good chance of winning the presidency. ... I think unless Republicans are as committed to very fundamental change in Washington that they will almost certainly lose the election."

Gingrich was promoting his new historical fiction novel, "Pearl Harbor." In the book, written with historian William R. Forstchen, the Japanese attack on the U.S. Pacific fleet is far more devastating than it actually was.