WASHINGTON - Presidential candidate Donald Trump says two of his children feel guilty about missing a voter registration deadline, meaning they will not be able to vote for him next week in New York's Republican primary.Eric Trump, 32, and Ivanka Trump, 34, the Republican front-runner's second and third children, have campaigned extensively with their father, but both missed the deadline for registering as Republicans to vote in the New York primary on April 19.In a telephone interview with "Fox & Friends," Trump joked that he would have to find some way to punish Eric and Ivanka for their mistake."No more allowance!" the New York billionaire said with a laugh.For already registered voters, any request to switch party affiliation must have been made by early October. The deadline for new voter registrations was March 25."They were unaware of the rules," Trump said Monday on Fox News. "They feel very, very guilty."But it's fine. I mean, I understand that."