In her resignation letter to Boris Johnson, Priti Patel says "it has been the honour of my life to serve our country as home secretary for the last three years and to deliver on our commitments to back and reform our police, stand up for the hard-working law-abiding majority, reform our immigration and asylum system, and fight terrorism".
"Your support over this period has delivered an unparalleled package of reforms and investment."
Speaking about policies on migration and slavery, including the Rwanda asylum scheme, Patel said: "As we know, there is no single solution to this huge challenge and the Government must tackle the full spectrum of issues to halt the illegal entry of migrants to the UK."
"I congratulate Liz Truss on being elected our new leader, and will give her my support as our new prime minister."
She continues: "It is my choice to continue my public service to the country and the Witham constituency from the backbenchers, once Liz formally assumes office and a new home secretary is appointed."
"From the backbenches, I will champion many of the policies I have stood up for both inside and outside government."