Republican Mike Huckabee, a former Baptist pastor and unabashed culture warrior, enters the race for the 2016 Republican presidential nomination on Tuesday facing competition for the support of social conservatives who backed him in 2008.
The ex-governor of Arkansas, 59, became a national figure by staging an upset win in Iowa's kickoff nominating contest during his 2008 presidential bid.
This time around other Republicans with national recognition have emerged as rivals for the role of leading crusader on social issues such as abortion rights and gay marriage.
Polls show Huckabee's support among Republican voters is only in the single digits. Huckabee's expected announcement is at 11 am (EDT).