WASHINGTON - Pushing back against the Democratic-led Congress, President Bush intends to veto a bill Wednesday that would have eased restraints on federally funded embryonic stem cell research - work that supporters say holds promise for fighting disease.

President Bush poses for a photo with House Speaker Nancy Pelosi during the Congressional Picnic, Tuesday, June 19, 2007, on the South Lawn of the White House Washington. [AP]

At the same time, Bush will discuss at a White House event his efforts to encourage work that could make additional stem cell lines available for research, presidential spokesman Tony Fratto said Tuesday.

The president has accused majority Democrats of recycling an old measure that he already vetoed and argued that the bill would mean American taxpayers would - for the first time - be compelled to support the deliberate destruction of human embryos.

"The president supports and encourages stem cell research - including using embryonic lines - as long as it does not involve creating, harming or destroying embryos," Fratto said. "That is an ethical line that should not be crossed."

Democrats made the legislation a top priority when they took control of the House and Senate in January, but they don't have enough votes to override Bush's decision.

Senate Majority Leader Harry Reid appealed to Bush on Tuesday not to veto the bill. He said the measure acknowledges the ethical issues at stake and offers even stronger research guidelines than exist under the president's current policy.

House Speaker Nancy Pelosi used Bush's veto threat as a reason to send out an e-mail letter soliciting contributions to the Democratic Congressional Campaign Committee to help elect more Democrats.

"By vetoing a bill that expands stem cell research, the president will say 'no' to the more than 70 percent of Americans who support it, 'no' to our Democratic Congress' fight for progress, and 'no' to saving lives and to potential cures for diseases such as diabetes and Parkinson's," Pelosi wrote. "He will say 'no' to hope."

In light of the veto, Sen. Norm Coleman, R-Minn., who planned to be at the White House event, sought support for a stem cell bill he is sponsoring. It has passed the Senate but has not yet been taken up by the House.

"My stem cell bill, which passed the Senate with broad bipartisan support, offers a clear alternative for our colleagues in the House to significantly expand federally funded stem cell research, while ensuring no taxpayer dollars are used for the destruction of human embryos," Coleman said.

Coleman urged Democrats who favored the bill Bush was to veto to get behind his legislation.

"Those who support the stem cell research bill ... are at a definitive crossroads," he said. "Do they seek to advance lifesaving research for millions of Americans suffering from serious disease or do they, in fact, prefer to keep stem cell research at a political stalemate? "

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