Donald Trump may have brought “millions of new voters” out to the polls, but he hasn’t presented a convincing enough case for two of his children, Eric and Ivanka. Neither will be able to vote for their father in the upcoming New York primaries because they forgot to register to vote for the right party.

The bad news was revealed this morning on Fox & Friends by host Brian Kilmeade. Trump responded:

They had a long-time register and they were, you know, unaware of the rules, and they didn’t register in time. So they feel very, very guilty. They feel very guilty. But it’s fine. I mean I understand that. I think they have to register a year in advance and they didn’t. So Eric and Ivanka, I guess, won’t be voting.

Despite appearing numerous times on the campaign trail in support of their father, Eric and Ivanka failed to follow their own instructions to millions of voters across the country. How did the Trump children screw up so badly?

There’s only one real possibility, backed up by information found on the New York State Board of Elections site: Neither was registered as a member of the Republican Party by October 2015, the deadline for registered New York voters to switch their party affiliation. Both Eric and Ivanka are listed as “not enrolled in a party.”

Trump and his wife Melania, on the other hand, are both registered Republicans, although for how long is anybody’s guess given Trump’s previous support of Democratic candidates and causes.

The October 2015 deadline was the result of a little-known law passed in 1976, which required registered New York voters planning on changing their party affiliation to do so a year before the registration deadline for the presidential election. The deadline this year is October 14th.

The revelation is just the latest embarrassment to the Trump campaign, which has seen its momentum slowed by a sustained effort of anti-Trump conservatives and gaffes by surrogates like Ben Carson.

Photo: Donald Trump (R) along with his children Eric (L), Ivanka (2nd L) and Donald Jr. attend a ceremony announcing a new hotel and condominium complex in Vancouver, British Columbia June 19, 2013. REUTERS/Andy Clark