HARRISBURG, Pa. (AP) – Sean Parnell announced his candidacy Tuesday for the Republican nomination for Pennsylvania’s open U.S. Senate seat. Parnell is a decorated Army veteran and regular guest on Fox News programs who became a favorite of former President Donald Trump. Parnell unsuccessfully challenged Democratic U.S. Rep. Conor Lamb in western Pennsylvania last year. The Senate seat in the presidential battleground state is being left open after two-term Republican Sen. Pat Toomey announced in October that he wouldn’t run again. Both the Democratic and Republican fields are getting crowded, with next year’s primary election still a year away.