Can the president of the united states remove his signature from a law after he signed it?

no they can not "unsign" it but they can The President may sign the bill at any time after its deliverance. If it sits unsigned for more than the 10-day period, it becomes law regardless of his signature or not. Normally, it is known if enough members will vote to override the bill two-thirds is needed

overview:

this is a technology-dependent lesson that students can guide at their own pace of exploration and learning. students share what they learn through the use of twitter (or alternative classroom sharing medium like todaysmeet). the use of a social sharing platform like twitter gives students a place for sharing with a wider audience, for more effective means of communication with each other, for incorporating viewpoints from all students in the classroom, and a means to reference thinking and learning by the use of a hashtag at a later time. students will understand the role the allied air forces played in the normandy invasion. teachers can use this as a stand-alone lesson or offer more structure by guiding students through each source, one by one. teachers may learn more about the eighth air force by accessing the abmc’s strategic bombing campaign interactive.