[2][12] In 1983, McMillan publicly supported a referendum election in unincorporated areas on Pleasure Island in Baldwin County.
McMillan stated he was convinced to do so after meetings with island residents who desired increased land use control, though his earlier zoning proposals were opposed by the Gulf Coast Area Chamber of Commerce and the committee to Protect Property Rights.
[12] In the aftermath of the Deepwater Horizon oil spill in 2011, McMillan was appointed by Governor Bob Riley along with two other state legislators to determine how to spend $15 million given to Baldwin County in response to the disaster.
[16][17] The same year, he defended a controversial immigration bill affecting Baldwin County, claiming that many of the problems that had been raised with the proposal by local farmers were actually products of inaccurate perceptions.
[18] In 2014, McMillan partnered with State Senator Gerald Dial to sponsor a bill that would guarantee the right to school prayer, despite concerns of constitutionality regarding the U.S. Supreme Court decision of Engel v.
[19] In 2017, McMillan targeted child abuse at residential camps and schools with HB-440, working with Prichard, Alabama, police captain Charles Kennedy to increase oversight of such facilities.
[20] The bill was signed into law on July 29, 2017, and received coverage in national news outlets,[21] with Vice News calling it "a rare example of increased government regulation of religion in the Trump era", as the law did not exclude religious camps from regulation.