Another House Republican is retiring.
A spokesman for Colorado Congressman Tom Tancredo has confirmed he will not seek a sixth term.
Tancredo is running for the Republican presidential nomination, but the spokesman says the decision not to seek re-election is separate from that effort.
More than a dozen House Republicans have recently announced plans not to seek another term.
Several, like Tancredo, aren't seeking re-election but are running for other offices.
The 61-year-old Tancredo has been running toward the rear of the Republican presidential field
He is an outspoken opponent of illegal immigration.