Israel is amassing troops and armored trucks on the border of Gaza as the escalation of fighting there enters its sixth day. Israel's cabinet authorized placing thousands of reservists on call, heightening concerns that Israel might invade the Hamas-run Palestinian enclave and possibly spark a wider conflict in the Middle East. Egypt and Turkey are sympathetic to Hamas and are among the nations pushing for a ceasefire. President Barack Obama said the U.S. fully supports Israel's right to defend itself. But Palestinian leaders called Israel's actions unjustified even though Israel has been the target of hundreds of rocket attacks in the past year. Diane and her guests discuss the conflict between Israel and Gaza.