On his first day back in office, he ordered an end to automatic - or birthright - citizenship for babies born to parents who are in the country illegally or temporarily. His executive order faced immediate opposition from those who said it went against the constitution's amendment that grants citizenship to anyone born in US territory. The Trump administration says the order will combat "significant threats to national security and public safety". A decision is expected in the summer. The January 2025 executive order is part of Trump's effort to reform the nation's immigration system, a cornerstone of his second-term agenda. If he does attend the court, it is believed it would be the first time a sitting president attends oral arguments there. It would also point to the importance he sees in this change becoming law. "I'm going," Trump told reporters in the Oval Office on Tuesday. "Because I have listened to this argument for so long." Opponents of his executive order, including more than a dozen states and five pregnant women, quickly filed lawsuits that challenged its legality under the 14th Amendment. (BBC)