The alignment of the dates in the emails and the Secret Service protective detail logs is significant because the authenticity of the emails, first published by the New York Post last week, is the subject of heated debate. The FBI, which purportedly obtained Hunter Biden's laptop in December last year, has not yet officially confirmed that it is in possession of the device and whether the emails are genuine.

In one alleged email, written after midnight on April 13, 2014, Hunter Biden wrote to Devon Archer, his business partner, that he will be traveling to Houston the next day. Secret Service logs obtained by the Senate Committee on Homeland Security and Governmental Affairs show a trip by Biden on April 13-14, 2014.

In another alleged email, Vadim Pozharskyi, a top executive from Ukrainian gas firm Burisma, wrote to Biden and Archer on May 12, 2014:

"Following our talks during the visit to the Como Lake and our further discussions, I would like to bring the following situation to your attention."

While the email doesn't cite a date for the trip, Secret Service logs include a travel entry for Biden on April 3-6, 2014.

In another alleged email, Archer wrote on May 12, 2014, that he is with Biden in Doha, Qatar.

Secret Service records include a trip by Biden to Doha, Qatar, on May 11-14, 2014.