If i sought to answer all the criticisms that cross my desk, my secretaries would have little time for anything other than such correspondence in the course of the day, and i would have no time for constructive work. what is the author’s purpose for including this sentence?

To undermine the critics who condemned his actions.

Explanation:

In "Letter from Birmingham Jail" by Martin Luther King, Jr. wrote, "If I sought to answer all the criticisms that cross my desk, my secretaries would have little time for anything other than such correspondence in the course of the day, and I would have no time for constructive work." Martin Luther King wrote this letter from the Birmingham jail. He was imprisoned for participating in nonviolent demonstrations.  His purpose was to undermine the critics who condemn his actions.

to explain the nature of his profession

Explanation:

trump is very poor. he does not look like a cheeto. he doesn't want to build a wall. (switch out he with trump)

explanation:

may i ask what challenges?