Jonathan Cahn is a Messianic Jewish (meaning that he combines his belief in Christ as the Messiah with Jewish traditions) rabbi and pastor whose literature has prophesied calamities in the United States. His 2012 book, "The Harbinger," compares 21st-century America to ancient Israel.
"The Harbinger," Cahn's most well-known work, focuses primarily on the terrorist attacks of September 11, 2001 in the United States. He asserts that the attacks were a divine warning to the United States. Cahn ties these attacks to Isaiah 9:10, which reads, "The bricks are fallen down, but we will build with hewn stones: the sycamores are cut down, but we will change them into cedars."
As of 2015, Cahn has recently warned of a great shaking that is coming, which he expects to affect the financial and economic realms. He claims that there is a seven-year Biblical pattern, citing the attacks of 2001 and the financial collapse of 2008 as his evidence (with the implication that something can be expected to happen in 2015).
However, Cahn, for the most part, disregards dates. According to him, God does not have to act in accordance with dates or times. Cahn insists that disastrous events unfold if the nation does not turn back to God. He cites the 2015 Supreme Court decision to legalize same-sex marriage as a critical step toward calamity.