YOU CAN'T CHANGE THE CONSTITUTION LEGISLATIVELY:

Pelosi threat to sue Bush over Iraq bill (Jonathan E. Kaplan and Elana Schor, May 09, 2007, The Hill)

House Speaker Nancy Pelosi (D-Calif.) is threatening to take President Bush to court if he issues a signing statement as a way of sidestepping a carefully crafted compromise Iraq war spending bill.

Pelosi recently told a group of liberal bloggers, “We can take the president to court” if he issues a signing statement, according to Kid Oakland, a blogger who covered Pelosi’s remarks for the liberal website dailykos.com.

“The president has made excessive use of signing statements and Congress is considering ways to respond to this executive-branch overreaching,” a spokesman for Pelosi, Nadeam Elshami, said. “Whether through the oversight or appropriations process or by enacting new legislation, the Democratic Congress will challenge the president’s non-enforcement of the laws.” [...]

Indicating that he may consider attaching a signing statement to a future supplemental spending measure, Bush last week wrote in his veto message, “This legislation is unconstitutional because it purports to direct the conduct of operations of the war in a way that infringes upon the powers vested in the presidency.”