I walked around and inside the Dome of the Rock when I was in Israel in 2000.
From the Jewish Press:
"The rabbanim are not talking halacha," Rabbi Moshe Tendler told The Jewish Press. "They’re issuing a political statement."
Last week two leading haredi rabbis, Rabbi Shalom Elyashiv and Rabbi Chaim Kanievsky, and former Sephardic chief rabbi Rav Ovadia Yosef, sent a letter to Rabbi Shmuel Rabinovich – who is in charge of the Western Wall area – asking him to reaffirm a 40-year-old ban on Jewish entry to the Temple Mount. The move came a month after Israel’s Haaretz newspaper published photographs of Rabbi Tendler atop the Temple Mount, which set off a storm in the haredi community. Rabbi Tendler, a Yeshiva University rosh yeshiva and biology professor, is the son-in-law of the late Rav Moshe Feinstein, the leading American halachic decisor of his time.
"As time passed," the three rabbis wrote, "we have lost knowledge of the precise location of the Temple, and anyone entering the Temple Mount is liable to unwittingly enter the area of the Temple and the Holy of Holies."
Rabbi Kanievsky added that "entrance to the Temple Mount, and the defilement of the Holy of Holies, is more severe than any of the violations in the Torah."
Rabbi Tendler (foreground left) and Temple Institute founder Rabbi Yisrael Ariel (right) atop the Temple Mount.
However, Rabbi Tendler argues that "everybody, certainly every rosh yeshiva and every talmid chacham, knows exactly" where a Jew may walk on the Temple Mount thanks to the research of such rabbis as the late Rabbis Shlomo Goren (former Israeli chief rabbi) and Yechiel Michel Tikochinsky.