Israelis have donated more than $87,000 to the service, which promises to schlep the non-observant to fun places on Saturdays.
The nation's population is 10 times larger than it was at its birth in 1948, with 74.4 percent of Israelis identifying as Jewish.
Rabbi Rick Jacobs said the young people who are scheduled to participate in trips to Israel sponsored by the Reform movement now "find themselves in this very difficult and troubling situation."
Sigmar Gabriel did not comment on the meeting with representatives of B'Tselem and Breaking the Silence, which took place without media present.
Ahead of Yom Haatzmaut, here are some things Israel gave the world in its 69th year of independence.
Sigmar Gabriel responded that it would be "regrettable" if Netanyahu cancelled their meeting but that "it would not be a catastrophe" either, and that it would not damage Israel-German ties.
Echoing the Israeli leader's line on Iran, the US official mentioned the Holocaust in addressing current threats facing the Jewish state.
The mother of one soldier threw water in a lawmaker's face; the Israeli prime minister said he “can’t know what it’s like to be a bereaved father.”
The state has cracked down on strikers and protestors and sought to remind the world that the leader of the protest is a convicted murderer.
A 57-year-old eastern Jerusalem man who police said is mentally ill allegedly stabbed a visiting student multiple times on the light rail.