From this:

A Colorado congressman is praising a bill recently introduced in the House that would curb voter fraud by requiring voters to actually prove their citizenship.

It is called the Federal Election Integrity Act of 2004 (H.R. 4530). Introduced by Illinois Republican Henry Hyde, it is designed to amend the National Voter Registration Act of 1993, also known as the "Motor Voter Bill." That Clinton-era legislation has been criticized because it provides no safeguards from illegal aliens being able to register to vote.
That is why one of the stated purposes of Hyde's legislation is to prevent fraud in federal elections. Tom Tancredo of the Congressional Immigration Reform Caucus says illegal alien voting has been a serious problem...