Thousands of demonstrators have turned out daily in Bangkok since the lower house of parliament last Friday passed a bill which could allow fugitive former premier Thaksin Shinawatra to return.
"I want protesters to end the rally. My government was born from elections so we respect the will of the people," Prime Minister Yingluck Shinawatra, Thaksin's younger sister, said in a televised address.
"Protests affect the economy and hurt foreign investor confidence, and tourists will not dare to come," she added.
Demonstrators were blocked by barbed wire barricades and riot police before reaching the seat of government.
More From This Section
"There are 4,000-5,000 police to secure key government facilities. All measures we use will be in accordance with the law," National Police Chief Adul Saengsingkaew told reporters.
"We will only use tear gas if protesters trespass into high security areas," he added.
"I am confident that everything is under control."
The ongoing rallies come despite signs that the government is stepping back from the amnesty.
The ruling Puea Thai party said yesterday that it would not seek to force through the amnesty without approval by the upper house, whose speaker has predicted that the bill will be rejected by senators.
"We can solve it through negotiations. I don't want to see a drawn-out rally because the amnesty bills were all cancelled and government will not resist the will of the people," Yingluck said.
A rift emerged today between senators over the timing of the upper house deliberations on the legislation.
Senate speaker Nikom Wairatpanij said he wanted to bring the debate forward for tomorrow, but it was uncertain if enough members would attend.