Final answer:
Republican support for DACA started to wane due to disputes over deportation, funding for a border wall, and broader divisions over immigration and undocumented immigrants.
Step-by-step explanation:
The support for DACA started to wane among Republicans due to several reasons. One reason was the dispute over the status of protection for those affected by the DACA immigration policy and whether they should face deportation. Another factor was the debate over funding for the construction of a Mexico-U.S. border wall.
Additionally, the deep divisions over immigration and the status of undocumented immigrants also contributed to the decline in Republican support for DACA. The Republican-dominated House of Representatives approved a bill that criminalized employing or aiding undocumented immigrants, leading to significant opposition and protests.
In summary, the waning support for DACA among Republicans can be attributed to disputes over deportation, the disagreement on border wall funding, and the broader divisions over immigration and undocumented immigrants.