 In theory, the Federal Assembly also functions as an instrument of checks and balances; upon request by a two-thirds majority of the National Council, it may impeach the president before the Constitutional Court, or upon request by a two-thirds majority in the National Council decide on a referendum to have the president removed from office.The assent of the Assembly would also be required for the president's immunity against criminal prosecution to be withdrawn.Furthermore, it is also responsible for declaring war.