Alcimus claims that Nicanor is disloyal (2 Macc 14:26-14:27)

“When Alcimus noticed their good will for one another, he took the covenant that had been made and went to King Demetrius. He told him that Nicanor was disloyal to the government. He had appointed that conspirator against the kingdom, Judas Maccabeus, to be his successor. The king became excited. Provoked by the false accusations of that depraved man, he wrote to Nicanor. He stated that he was displeased with the covenant. He commanded him to send Judas Maccabeus to Antioch as a prisoner without delay.”

Alcimus, the high priest in Jerusalem, was not pleased at the turn of events. He took the treaty that Nicanor and Judas Maccabeus had agreed on to King Demetrius I. He pointed out that Nicanor had been disloyal to king since his instructions were to kill Judas Maccabeus. Instead, Judas Maccabeus was to become the new high priest as the successor to Alcimus. King Demetrius I was very upset by these accusations. He wrote to Nicanor that he did not like the treaty. He commanded him to send Judas Maccabeus in chains as a prisoner to Antioch without any delay. None of this was in 1 Maccabees.