A presidential elector representing Texas declared last week that he would not vote for Donald Trump when the electoral college meets Monday.

He is the second Republican elector this year to refuse to cast his vote in accordance with the results in his state.

Christopher Suprun, a paramedic and former firefighter who was one of the first responders on Sept. 11, wrote in a New York Times op-ed that Trump is “someone who shows daily he is not qualified for the office.”

Suprun said he had a legal right and constitutional duty to vote his conscience — and planned to do so.

Suprun's announcement followed one by Art Sisneros, another Republican elector in Texas, who this month wrote that he would resign rather than cast his vote for Trump.

Suprun joins a handful of other “faithless electors” in U.S. history. (But since Sisneros resigned, he is not technically “faithless.”)

Samuel Miles of Pennsylvania had the distinction of being the first, in 1796.

Miles was a Federalist who had promised to vote for the Federalist candidate, John Adams, but instead cast his vote for Democratic-Republican candidate Thomas Jefferson.

There have been a total of 157 faithless voters to date, according to FairVote.org, a nonprofit that advocates for national popular-vote elections for president.

Several of them broke with the electorate less out of rebellion than for practical reasons. Throughout the years, 71 electors have changed their votes because the candidate their state chose died before the electoral college could convene.

In 1872, for example, Horace Greeley, the nominee of both the Democratic and Liberal Republican parties, lost the general election and died 24 days later . Sixty-three of the 66 Democratic electors refused to vote for a deceased candidate.

The Constitution does not require electors to cast their votes according to the popular vote in their states, but the laws of 29 states and the District of Columbia bind electors to do so. Some require pledges or threaten fines or criminal action, according to a summary of state laws by the National Association of Secretaries of State.

No elector has ever been prosecuted for not voting as pledged.