Jon Gosselin reads to ET an email he said he received from Kate this morning…

The drama continues between Jon and Kate Gosselin. ET caught up with the reality star dad in New York City, who revealed that his estranged wife Kate is seeking to change their joint-custody arrangements.

ET was with Jon as he geared up to celebrate the birthday of his twins, Cara and Mady. Jon told ET that Kate requested that he only be at their Pennsylvania home from 4 p.m. to 6 p.m. on Thursday for the twin's birthday party. He also alleges that Kate is attempting to revise the custody agreement for this weekend, saying she gave him a schedule.

"She's trying to prevent me from seeing my kids on Mady and Cara's birthday," the father-of-eight said of Kate. "That's like giving her full custody by obeying her."

Jon read an email that he said was from his estranged wife regarding the kids' party. The reality star said the email read, "Due to recent events, it will be too stressful to the kids to have both of us here as planned. I would like to split the evening so they can see us both."

"It's an all-out battle," Jon said of his current relationship with Kate. "She can't tell me what to do."

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